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Version:
9.6.1-1PGDG.el7 ▾
|
<!-- doc/src/sgml/release-9.4.sgml -->
<!-- See header comment in release.sgml about typical markup -->
<sect1 id="release-9-4-10">
<title>Release 9.4.10</title>
<note>
<title>Release Date</title>
<simpara>2016-10-27</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.9.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.10</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if your installation has been affected by the bug described in
the first changelog entry below, then after updating you may need
to take action to repair corrupted free space maps.
</para>
<para>
Also, if you are upgrading from a version earlier than 9.4.6,
see <xref linkend="release-9-4-6">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Fix WAL-logging of truncation of relation free space maps and
visibility maps (Pavan Deolasee, Heikki Linnakangas)
</para>
<para>
It was possible for these files to not be correctly restored during
crash recovery, or to be written incorrectly on a standby server.
Bogus entries in a free space map could lead to attempts to access
pages that have been truncated away from the relation itself, typically
producing errors like <quote>could not read block <replaceable>XXX</>:
read only 0 of 8192 bytes</quote>. Checksum failures in the
visibility map are also possible, if checksumming is enabled.
</para>
<para>
Procedures for determining whether there is a problem and repairing it
if so are discussed at
<ulink url="https://wiki.postgresql.org/wiki/Free_Space_Map_Problems"></>.
</para>
</listitem>
<listitem>
<para>
Fix incorrect creation of GIN index WAL records on big-endian machines
(Tom Lane)
</para>
<para>
The typical symptom was <quote>unexpected GIN leaf action</> errors
during WAL replay.
</para>
</listitem>
<listitem>
<para>
Fix <command>SELECT FOR UPDATE/SHARE</> to correctly lock tuples that
have been updated by a subsequently-aborted transaction
(Álvaro Herrera)
</para>
<para>
In 9.5 and later, the <command>SELECT</> would sometimes fail to
return such tuples at all. A failure has not been proven to occur in
earlier releases, but might be possible with concurrent updates.
</para>
</listitem>
<listitem>
<para>
Fix EvalPlanQual rechecks involving CTE scans (Tom Lane)
</para>
<para>
The recheck would always see the CTE as returning no rows, typically
leading to failure to update rows that were recently updated.
</para>
</listitem>
<listitem>
<para>
Fix improper repetition of previous results from hashed aggregation in
a subquery (Andrew Gierth)
</para>
<para>
The test to see if we can reuse a previously-computed hash table of
the aggregate state values neglected the possibility of an outer query
reference appearing in an aggregate argument expression. A change in
the value of such a reference should lead to recalculating the hash
table, but did not.
</para>
</listitem>
<listitem>
<para>
Fix query-lifespan memory leak in a bulk <command>UPDATE</> on a table
with a <literal>PRIMARY KEY</> or <literal>REPLICA IDENTITY</> index
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix <command>EXPLAIN</> to emit valid XML when
<xref linkend="guc-track-io-timing"> is on (Markus Winand)
</para>
<para>
Previously the XML output-format option produced syntactically invalid
tags such as <literal><I/O-Read-Time></>. That is now
rendered as <literal><I-O-Read-Time></>.
</para>
</listitem>
<listitem>
<para>
Suppress printing of zeroes for unmeasured times
in <command>EXPLAIN</> (Maksim Milyutin)
</para>
<para>
Certain option combinations resulted in printing zero values for times
that actually aren't ever measured in that combination. Our general
policy in <command>EXPLAIN</> is not to print such fields at all, so
do that consistently in all cases.
</para>
</listitem>
<listitem>
<para>
Fix timeout length when <command>VACUUM</> is waiting for exclusive
table lock so that it can truncate the table (Simon Riggs)
</para>
<para>
The timeout was meant to be 50 milliseconds, but it was actually only
50 microseconds, causing <command>VACUUM</> to give up on truncation
much more easily than intended. Set it to the intended value.
</para>
</listitem>
<listitem>
<para>
Fix bugs in merging inherited <literal>CHECK</> constraints while
creating or altering a table (Tom Lane, Amit Langote)
</para>
<para>
Allow identical <literal>CHECK</> constraints to be added to a parent
and child table in either order. Prevent merging of a valid
constraint from the parent table with a <literal>NOT VALID</>
constraint on the child. Likewise, prevent merging of a <literal>NO
INHERIT</> child constraint with an inherited constraint.
</para>
</listitem>
<listitem>
<para>
Remove artificial restrictions on the values accepted
by <function>numeric_in()</> and <function>numeric_recv()</>
(Tom Lane)
</para>
<para>
We allow numeric values up to the limit of the storage format (more
than <literal>1e100000</>), so it seems fairly pointless
that <function>numeric_in()</> rejected scientific-notation exponents
above 1000. Likewise, it was silly for <function>numeric_recv()</> to
reject more than 1000 digits in an input value.
</para>
</listitem>
<listitem>
<para>
Avoid very-low-probability data corruption due to testing tuple
visibility without holding buffer lock (Thomas Munro, Peter Geoghegan,
Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix logical WAL decoding to work properly when a subtransaction's WAL
output is large enough to spill to disk (Andres Freund)
</para>
</listitem>
<listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_4_STABLE [10ad15f48] 2016-09-01 11:45:16 -0400
-->
<para>
Fix buffer overread in logical WAL decoding (Tom Lane)
</para>
<para>
Logical decoding of a tuple update record read 23 bytes too many,
which was usually harmless but with very bad luck could result in a
crash.
</para>
</listitem>
<listitem>
<para>
Fix file descriptor leakage when truncating a temporary relation of
more than 1GB (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Disallow starting a standalone backend with <literal>standby_mode</>
turned on (Michael Paquier)
</para>
<para>
This can't do anything useful, since there will be no WAL receiver
process to fetch more WAL data; and it could result in misbehavior
in code that wasn't designed with this situation in mind.
</para>
</listitem>
<listitem>
<para>
Properly initialize replication slot state when recycling a
previously-used slot (Michael Paquier)
</para>
<para>
This failure to reset all of the fields of the slot could
prevent <command>VACUUM</> from removing dead tuples.
</para>
</listitem>
<listitem>
<para>
Round shared-memory allocation request to a multiple of the actual
huge page size when attempting to use huge pages on Linux (Tom Lane)
</para>
<para>
This avoids possible failures during <function>munmap()</> on systems
with atypical default huge page sizes. Except in crash-recovery
cases, there were no ill effects other than a log message.
</para>
</listitem>
<listitem>
<para>
Use a more random value for the dynamic shared memory control
segment's ID (Robert Haas, Tom Lane)
</para>
<para>
Previously, the same value would be chosen every time, because it was
derived from <function>random()</> but <function>srandom()</> had not
yet been called. While relatively harmless, this was not the intended
behavior.
</para>
</listitem>
<listitem>
<para>
On Windows, retry creation of the dynamic shared memory control
segment after an access-denied error (Kyotaro Horiguchi, Amit Kapila)
</para>
<para>
Windows sometimes returns <literal>ERROR_ACCESS_DENIED</> rather
than <literal>ERROR_ALREADY_EXISTS</> when there is an existing
segment. This led to postmaster startup failure due to believing that
the former was an unrecoverable error.
</para>
</listitem>
<listitem>
<para>
Don't try to share SSL contexts across multiple connections
in <application>libpq</> (Heikki Linnakangas)
</para>
<para>
This led to assorted corner-case bugs, particularly when trying to use
different SSL parameters for different connections.
</para>
</listitem>
<listitem>
<para>
Avoid corner-case memory leak in <application>libpq</> (Tom Lane)
</para>
<para>
The reported problem involved leaking an error report
during <function>PQreset()</>, but there might be related cases.
</para>
</listitem>
<listitem>
<para>
Make <application>ecpg</>'s <option>--help</> and <option>--version</>
options work consistently with our other executables (Haribabu Kommi)
</para>
</listitem>
<listitem>
<para>
Fix <application>pgbench</>'s calculation of average latency
(Fabien Coelho)
</para>
<para>
The calculation was incorrect when there were <literal>\sleep</>
commands in the script, or when the test duration was specified in
number of transactions rather than total time.
</para>
</listitem>
<listitem>
<para>
In <application>pg_dump</>, never dump range constructor functions
(Tom Lane)
</para>
<para>
This oversight led to <application>pg_upgrade</> failures with
extensions containing range types, due to duplicate creation of the
constructor functions.
</para>
</listitem>
<listitem>
<para>
In <application>pg_xlogdump</>, retry opening new WAL segments when
using <option>--follow</> option (Magnus Hagander)
</para>
<para>
This allows for a possible delay in the server's creation of the next
segment.
</para>
</listitem>
<listitem>
<para>
Fix <application>pg_xlogdump</> to cope with a WAL file that begins
with a continuation record spanning more than one page (Pavan
Deolasee)
</para>
</listitem>
<listitem>
<para>
Fix <filename>contrib/pg_buffercache</> to work
when <varname>shared_buffers</> exceeds 256GB (KaiGai Kohei)
</para>
</listitem>
<listitem>
<para>
Fix <filename>contrib/intarray/bench/bench.pl</> to print the results
of the <command>EXPLAIN</> it does when given the <option>-e</> option
(Daniel Gustafsson)
</para>
</listitem>
<listitem>
<para>
Install TAP test infrastructure so that it's available for extension
testing (Craig Ringer)
</para>
<para>
When <productname>PostgreSQL</> has been configured
with <option>--enable-tap-tests</>, <quote>make install</> will now
install the Perl support files for TAP testing where PGXS can find
them. This allows non-core extensions to
use <literal>$(prove_check)</> without extra tests.
</para>
</listitem>
<listitem>
<para>
In MSVC builds, include <application>pg_recvlogical</> in a
client-only installation (MauMau)
</para>
</listitem>
<listitem>
<para>
Update Windows time zone mapping to recognize some time zone names
added in recent Windows versions (Michael Paquier)
</para>
</listitem>
<listitem>
<para>
Prevent failure of obsolete dynamic time zone abbreviations (Tom Lane)
</para>
<para>
If a dynamic time zone abbreviation does not match any entry in the
referenced time zone, treat it as equivalent to the time zone name.
This avoids unexpected failures when IANA removes abbreviations from
their time zone database, as they did in <application>tzdata</>
release 2016f and seem likely to do again in the future. The
consequences were not limited to not recognizing the individual
abbreviation; any mismatch caused
the <structname>pg_timezone_abbrevs</> view to fail altogether.
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2016h
for DST law changes in Palestine and Turkey, plus historical
corrections for Turkey and some regions of Russia.
Switch to numeric abbreviations for some time zones in Antarctica,
the former Soviet Union, and Sri Lanka.
</para>
<para>
The IANA time zone database previously provided textual abbreviations
for all time zones, sometimes making up abbreviations that have little
or no currency among the local population. They are in process of
reversing that policy in favor of using numeric UTC offsets in zones
where there is no evidence of real-world use of an English
abbreviation. At least for the time being, <productname>PostgreSQL</>
will continue to accept such removed abbreviations for timestamp input.
But they will not be shown in the <structname>pg_timezone_names</>
view nor used for output.
</para>
<para>
In this update, <literal>AMT</> is no longer shown as being in use to
mean Armenia Time. Therefore, we have changed the <literal>Default</>
abbreviation set to interpret it as Amazon Time, thus UTC-4 not UTC+4.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-9">
<title>Release 9.4.9</title>
<note>
<title>Release Date</title>
<simpara>2016-08-11</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.8.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.9</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading from a version earlier than 9.4.6,
see <xref linkend="release-9-4-6">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Fix possible mis-evaluation of
nested <literal>CASE</>-<literal>WHEN</> expressions (Heikki
Linnakangas, Michael Paquier, Tom Lane)
</para>
<para>
A <literal>CASE</> expression appearing within the test value
subexpression of another <literal>CASE</> could become confused about
whether its own test value was null or not. Also, inlining of a SQL
function implementing the equality operator used by
a <literal>CASE</> expression could result in passing the wrong test
value to functions called within a <literal>CASE</> expression in the
SQL function's body. If the test values were of different data
types, a crash might result; moreover such situations could be abused
to allow disclosure of portions of server memory. (CVE-2016-5423)
</para>
</listitem>
<listitem>
<para>
Fix client programs' handling of special characters in database and
role names (Noah Misch, Nathan Bossart, Michael Paquier)
</para>
<para>
Numerous places in <application>vacuumdb</> and other client programs
could become confused by database and role names containing double
quotes or backslashes. Tighten up quoting rules to make that safe.
Also, ensure that when a conninfo string is used as a database name
parameter to these programs, it is correctly treated as such throughout.
</para>
<para>
Fix handling of paired double quotes
in <application>psql</>'s <command>\connect</>
and <command>\password</> commands to match the documentation.
</para>
<para>
Introduce a new <option>-reuse-previous</> option
in <application>psql</>'s <command>\connect</> command to allow
explicit control of whether to re-use connection parameters from a
previous connection. (Without this, the choice is based on whether
the database name looks like a conninfo string, as before.) This
allows secure handling of database names containing special
characters in <application>pg_dumpall</> scripts.
</para>
<para>
<application>pg_dumpall</> now refuses to deal with database and role
names containing carriage returns or newlines, as it seems impractical
to quote those characters safely on Windows. In future we may reject
such names on the server side, but that step has not been taken yet.
</para>
<para>
These are considered security fixes because crafted object names
containing special characters could have been used to execute
commands with superuser privileges the next time a superuser
executes <application>pg_dumpall</> or other routine maintenance
operations. (CVE-2016-5424)
</para>
</listitem>
<listitem>
<para>
Fix corner-case misbehaviors for <literal>IS NULL</>/<literal>IS NOT
NULL</> applied to nested composite values (Andrew Gierth, Tom Lane)
</para>
<para>
The SQL standard specifies that <literal>IS NULL</> should return
TRUE for a row of all null values (thus <literal>ROW(NULL,NULL) IS
NULL</> yields TRUE), but this is not meant to apply recursively
(thus <literal>ROW(NULL, ROW(NULL,NULL)) IS NULL</> yields FALSE).
The core executor got this right, but certain planner optimizations
treated the test as recursive (thus producing TRUE in both cases),
and <filename>contrib/postgres_fdw</> could produce remote queries
that misbehaved similarly.
</para>
</listitem>
<listitem>
<para>
Make the <type>inet</> and <type>cidr</> data types properly reject
IPv6 addresses with too many colon-separated fields (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Prevent crash in <function>close_ps()</>
(the <type>point</> <literal>##</> <type>lseg</> operator)
for NaN input coordinates (Tom Lane)
</para>
<para>
Make it return NULL instead of crashing.
</para>
</listitem>
<listitem>
<para>
Avoid possible crash in <function>pg_get_expr()</> when inconsistent
values are passed to it (Michael Paquier, Thomas Munro)
</para>
</listitem>
<listitem>
<para>
Fix several one-byte buffer over-reads in <function>to_number()</>
(Peter Eisentraut)
</para>
<para>
In several cases the <function>to_number()</> function would read one
more character than it should from the input string. There is a
small chance of a crash, if the input happens to be adjacent to the
end of memory.
</para>
</listitem>
<listitem>
<para>
Do not run the planner on the query contained in <literal>CREATE
MATERIALIZED VIEW</> or <literal>CREATE TABLE AS</>
when <literal>WITH NO DATA</> is specified (Michael Paquier,
Tom Lane)
</para>
<para>
This avoids some unnecessary failure conditions, for example if a
stable function invoked by the materialized view depends on a table
that doesn't exist yet.
</para>
</listitem>
<listitem>
<para>
Avoid unsafe intermediate state during expensive paths
through <function>heap_update()</> (Masahiko Sawada, Andres Freund)
</para>
<para>
Previously, these cases locked the target tuple (by setting its XMAX)
but did not WAL-log that action, thus risking data integrity problems
if the page were spilled to disk and then a database crash occurred
before the tuple update could be completed.
</para>
</listitem>
<listitem>
<para>
Fix hint bit update during WAL replay of row locking operations
(Andres Freund)
</para>
<para>
The only known consequence of this problem is that row locks held by
a prepared, but uncommitted, transaction might fail to be enforced
after a crash and restart.
</para>
</listitem>
<listitem>
<para>
Avoid unnecessary <quote>could not serialize access</> errors when
acquiring <literal>FOR KEY SHARE</> row locks in serializable mode
(Álvaro Herrera)
</para>
</listitem>
<listitem>
<para>
Avoid crash in <literal>postgres -C</> when the specified variable
has a null string value (Michael Paquier)
</para>
</listitem>
<listitem>
<para>
Fix possible loss of large subtransactions in logical decoding
(Petru-Florin Mihancea)
</para>
</listitem>
<listitem>
<para>
Fix failure of logical decoding when a subtransaction contains no
actual changes (Marko Tiikkaja, Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Ensure that backends see up-to-date statistics for shared catalogs
(Tom Lane)
</para>
<para>
The statistics collector failed to update the statistics file for
shared catalogs after a request from a regular backend. This problem
was partially masked because the autovacuum launcher regularly makes
requests that did cause such updates; however, it became obvious with
autovacuum disabled.
</para>
</listitem>
<listitem>
<para>
Avoid redundant writes of the statistics files when multiple
backends request updates close together (Tom Lane, Tomas Vondra)
</para>
</listitem>
<listitem>
<para>
Avoid consuming a transaction ID during <command>VACUUM</>
(Alexander Korotkov)
</para>
<para>
Some cases in <command>VACUUM</> unnecessarily caused an XID to be
assigned to the current transaction. Normally this is negligible,
but if one is up against the XID wraparound limit, consuming more
XIDs during anti-wraparound vacuums is a very bad thing.
</para>
</listitem>
<listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL9_4_STABLE [7a0f09da7] 2016-05-25 19:39:49 -0400
Branch: REL9_3_STABLE [6537a48c5] 2016-05-25 19:39:49 -0400
Branch: REL9_2_STABLE [294509ea9] 2016-05-25 19:39:49 -0400
Branch: REL9_1_STABLE [de887cc8a] 2016-05-25 19:39:49 -0400
-->
<para>
Avoid canceling hot-standby queries during <command>VACUUM FREEZE</>
(Simon Riggs, Álvaro Herrera)
</para>
<para>
<command>VACUUM FREEZE</> on an otherwise-idle master server could
result in unnecessary cancellations of queries on its standby
servers.
</para>
</listitem>
<listitem>
<para>
Prevent possible failure when vacuuming multixact IDs in an
installation that has been pg_upgrade'd from pre-9.3 (Andrew Gierth,
Álvaro Herrera)
</para>
<para>
The usual symptom of this bug is errors
like <quote>MultiXactId <replaceable>NNN</> has not been created
yet -- apparent wraparound</quote>.
</para>
</listitem>
<listitem>
<para>
When a manual <command>ANALYZE</> specifies a column list, don't
reset the table's <literal>changes_since_analyze</> counter
(Tom Lane)
</para>
<para>
If we're only analyzing some columns, we should not prevent routine
auto-analyze from happening for the other columns.
</para>
</listitem>
<listitem>
<para>
Fix <command>ANALYZE</>'s overestimation of <literal>n_distinct</>
for a unique or nearly-unique column with many null entries (Tom
Lane)
</para>
<para>
The nulls could get counted as though they were themselves distinct
values, leading to serious planner misestimates in some types of
queries.
</para>
</listitem>
<listitem>
<para>
Prevent autovacuum from starting multiple workers for the same shared
catalog (Álvaro Herrera)
</para>
<para>
Normally this isn't much of a problem because the vacuum doesn't take
long anyway; but in the case of a severely bloated catalog, it could
result in all but one worker uselessly waiting instead of doing
useful work on other tables.
</para>
</listitem>
<listitem>
<para>
Avoid duplicate buffer lock release when abandoning a b-tree index
page deletion attempt (Tom Lane)
</para>
<para>
This mistake prevented <command>VACUUM</> from completing in some
cases involving corrupt b-tree indexes.
</para>
</listitem>
<listitem>
<para>
Prevent infinite loop in GiST index build for geometric columns
containing NaN component values (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix <filename>contrib/btree_gin</> to handle the smallest
possible <type>bigint</> value correctly (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Teach libpq to correctly decode server version from future servers
(Peter Eisentraut)
</para>
<para>
It's planned to switch to two-part instead of three-part server
version numbers for releases after 9.6. Make sure
that <function>PQserverVersion()</> returns the correct value for
such cases.
</para>
</listitem>
<listitem>
<para>
Fix <application>ecpg</>'s code for <literal>unsigned long long</>
array elements (Michael Meskes)
</para>
</listitem>
<listitem>
<para>
In <application>pg_dump</> with both <option>-c</> and <option>-C</>
options, avoid emitting an unwanted <literal>CREATE SCHEMA public</>
command (David Johnston, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Improve handling of <systemitem>SIGTERM</>/control-C in
parallel <application>pg_dump</> and <application>pg_restore</> (Tom
Lane)
</para>
<para>
Make sure that the worker processes will exit promptly, and also arrange
to send query-cancel requests to the connected backends, in case they
are doing something long-running such as a <command>CREATE INDEX</>.
</para>
</listitem>
<listitem>
<para>
Fix error reporting in parallel <application>pg_dump</>
and <application>pg_restore</> (Tom Lane)
</para>
<para>
Previously, errors reported by <application>pg_dump</>
or <application>pg_restore</> worker processes might never make it to
the user's console, because the messages went through the master
process, and there were various deadlock scenarios that would prevent
the master process from passing on the messages. Instead, just print
everything to <literal>stderr</>. In some cases this will result in
duplicate messages (for instance, if all the workers report a server
shutdown), but that seems better than no message.
</para>
</listitem>
<listitem>
<para>
Ensure that parallel <application>pg_dump</>
or <application>pg_restore</> on Windows will shut down properly
after an error (Kyotaro Horiguchi)
</para>
<para>
Previously, it would report the error, but then just sit until
manually stopped by the user.
</para>
</listitem>
<listitem>
<para>
Make <application>pg_dump</> behave better when built without zlib
support (Kyotaro Horiguchi)
</para>
<para>
It didn't work right for parallel dumps, and emitted some rather
pointless warnings in other cases.
</para>
</listitem>
<listitem>
<para>
Make <application>pg_basebackup</> accept <literal>-Z 0</> as
specifying no compression (Fujii Masao)
</para>
</listitem>
<listitem>
<para>
Fix makefiles' rule for building AIX shared libraries to be safe for
parallel make (Noah Misch)
</para>
</listitem>
<listitem>
<para>
Fix TAP tests and MSVC scripts to work when build directory's path
name contains spaces (Michael Paquier, Kyotaro Horiguchi)
</para>
</listitem>
<listitem>
<para>
Be more predictable about reporting <quote>statement timeout</>
versus <quote>lock timeout</> (Tom Lane)
</para>
<para>
On heavily loaded machines, the regression tests sometimes failed due
to reporting <quote>lock timeout</> even though the statement timeout
should have occurred first.
</para>
</listitem>
<listitem>
<para>
Make regression tests safe for Danish and Welsh locales (Jeff Janes,
Tom Lane)
</para>
<para>
Change some test data that triggered the unusual sorting rules of
these locales.
</para>
</listitem>
<listitem>
<para>
Update our copy of the timezone code to match
IANA's <application>tzcode</> release 2016c (Tom Lane)
</para>
<para>
This is needed to cope with anticipated future changes in the time
zone data files. It also fixes some corner-case bugs in coping with
unusual time zones.
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2016f
for DST law changes in Kemerovo and Novosibirsk, plus historical
corrections for Azerbaijan, Belarus, and Morocco.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-8">
<title>Release 9.4.8</title>
<note>
<title>Release Date</title>
<simpara>2016-05-12</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.7.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.8</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading from a version earlier than 9.4.6,
see <xref linkend="release-9-4-6">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Clear the OpenSSL error queue before OpenSSL calls, rather than
assuming it's clear already; and make sure we leave it clear
afterwards (Peter Geoghegan, Dave Vitek, Peter Eisentraut)
</para>
<para>
This change prevents problems when there are multiple connections
using OpenSSL within a single process and not all the code involved
follows the same rules for when to clear the error queue.
Failures have been reported specifically when a client application
uses SSL connections in <application>libpq</> concurrently with
SSL connections using the PHP, Python, or Ruby wrappers for OpenSSL.
It's possible for similar problems to arise within the server as well,
if an extension module establishes an outgoing SSL connection.
</para>
</listitem>
<listitem>
<para>
Fix <quote>failed to build any <replaceable>N</>-way joins</quote>
planner error with a full join enclosed in the right-hand side of a
left join (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix incorrect handling of equivalence-class tests in multilevel
nestloop plans (Tom Lane)
</para>
<para>
Given a three-or-more-way equivalence class of variables, such
as <literal>X.X = Y.Y = Z.Z</>, it was possible for the planner to omit
some of the tests needed to enforce that all the variables are actually
equal, leading to join rows being output that didn't satisfy
the <literal>WHERE</> clauses. For various reasons, erroneous plans
were seldom selected in practice, so that this bug has gone undetected
for a long time.
</para>
</listitem>
<listitem>
<para>
Fix query-lifespan memory leak in GIN index scans (Julien Rouhaud)
</para>
</listitem>
<listitem>
<para>
Fix query-lifespan memory leak and potential index corruption hazard in
GIN index insertion (Tom Lane)
</para>
<para>
The memory leak would typically not amount to much in simple queries,
but it could be very substantial during a large GIN index build with
high <varname>maintenance_work_mem</>.
</para>
</listitem>
<listitem>
<para>
Fix possible misbehavior of <literal>TH</>, <literal>th</>,
and <literal>Y,YYY</> format codes in <function>to_timestamp()</>
(Tom Lane)
</para>
<para>
These could advance off the end of the input string, causing subsequent
format codes to read garbage.
</para>
</listitem>
<listitem>
<para>
Fix dumping of rules and views in which the <replaceable>array</>
argument of a <literal><replaceable>value</> <replaceable>operator</>
ANY (<replaceable>array</>)</literal> construct is a sub-SELECT
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Disallow newlines in <command>ALTER SYSTEM</> parameter values
(Tom Lane)
</para>
<para>
The configuration-file parser doesn't support embedded newlines in
string literals, so we mustn't allow them in values to be inserted
by <command>ALTER SYSTEM</>.
</para>
</listitem>
<listitem>
<para>
Fix <command>ALTER TABLE ... REPLICA IDENTITY USING INDEX</> to
work properly if an index on OID is selected (David Rowley)
</para>
</listitem>
<listitem>
<para>
Fix crash in logical decoding on alignment-picky platforms (Tom Lane,
Andres Freund)
</para>
<para>
The failure occurred only with a transaction large enough to spill to
disk and a primary-key change within that transaction.
</para>
</listitem>
<listitem>
<para>
Avoid repeated requests for feedback from receiver while shutting down
walsender (Nick Cleaton)
</para>
</listitem>
<listitem>
<para>
Make <application>pg_regress</> use a startup timeout from the
<envar>PGCTLTIMEOUT</> environment variable, if that's set (Tom Lane)
</para>
<para>
This is for consistency with a behavior recently added
to <application>pg_ctl</>; it eases automated testing on slow machines.
</para>
</listitem>
<listitem>
<para>
Fix <application>pg_upgrade</> to correctly restore extension
membership for operator families containing only one operator class
(Tom Lane)
</para>
<para>
In such a case, the operator family was restored into the new database,
but it was no longer marked as part of the extension. This had no
immediate ill effects, but would cause later <application>pg_dump</>
runs to emit output that would cause (harmless) errors on restore.
</para>
</listitem>
<listitem>
<para>
Fix <application>pg_upgrade</> to not fail when new-cluster TOAST rules
differ from old (Tom Lane)
</para>
<para>
<application>pg_upgrade</> had special-case code to handle the
situation where the new <productname>PostgreSQL</> version thinks that
a table should have a TOAST table while the old version did not. That
code was broken, so remove it, and instead do nothing in such cases;
there seems no reason to believe that we can't get along fine without
a TOAST table if that was okay according to the old version's rules.
</para>
</listitem>
<listitem>
<para>
Reduce the number of SysV semaphores used by a build configured with
<option>--disable-spinlocks</> (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Rename internal function <function>strtoi()</>
to <function>strtoint()</> to avoid conflict with a NetBSD library
function (Thomas Munro)
</para>
</listitem>
<listitem>
<para>
Fix reporting of errors from <function>bind()</>
and <function>listen()</> system calls on Windows (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Reduce verbosity of compiler output when building with Microsoft Visual
Studio (Christian Ullrich)
</para>
</listitem>
<listitem>
<para>
Fix <function>putenv()</> to work properly with Visual Studio 2013
(Michael Paquier)
</para>
</listitem>
<listitem>
<para>
Avoid possibly-unsafe use of Windows' <function>FormatMessage()</>
function (Christian Ullrich)
</para>
<para>
Use the <literal>FORMAT_MESSAGE_IGNORE_INSERTS</> flag where
appropriate. No live bug is known to exist here, but it seems like a
good idea to be careful.
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2016d
for DST law changes in Russia and Venezuela. There are new zone
names <literal>Europe/Kirov</> and <literal>Asia/Tomsk</> to reflect
the fact that these regions now have different time zone histories from
adjacent regions.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-7">
<title>Release 9.4.7</title>
<note>
<title>Release Date</title>
<simpara>2016-03-31</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.6.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.7</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading from a version earlier than 9.4.6,
see <xref linkend="release-9-4-6">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<listitem>
<para>
Fix incorrect handling of NULL index entries in
indexed <literal>ROW()</> comparisons (Tom Lane)
</para>
<para>
An index search using a row comparison such as <literal>ROW(a, b) >
ROW('x', 'y')</> would stop upon reaching a NULL entry in
the <structfield>b</> column, ignoring the fact that there might be
non-NULL <structfield>b</> values associated with later values
of <structfield>a</>.
</para>
</listitem>
<listitem>
<para>
Avoid unlikely data-loss scenarios due to renaming files without
adequate <function>fsync()</> calls before and after (Michael Paquier,
Tomas Vondra, Andres Freund)
</para>
</listitem>
<listitem>
<para>
Fix bug in <function>json_to_record()</> when a field of its input
object contains a sub-object with a field name matching one of the
requested output column names (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix misformatting of negative time zone offsets
by <function>to_char()</>'s <literal>OF</> format code
(Thomas Munro, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Ignore <xref linkend="recovery-min-apply-delay"> parameter until
recovery has reached a consistent state (Michael Paquier)
</para>
<para>
Previously, standby servers would delay application of WAL records in
response to <varname>recovery_min_apply_delay</> even while replaying
the initial portion of WAL needed to make their database state valid.
Since the standby is useless until it's reached a consistent database
state, this was deemed unhelpful.
</para>
</listitem>
<listitem>
<para>
Correctly handle cases where <literal>pg_subtrans</> is close to XID
wraparound during server startup (Jeff Janes)
</para>
</listitem>
<listitem>
<para>
Fix assorted bugs in logical decoding (Andres Freund)
</para>
<para>
Trouble cases included tuples larger than one page when replica
identity is <literal>FULL</>, <command>UPDATE</>s that change a
primary key within a transaction large enough to be spooled to disk,
incorrect reports of <quote>subxact logged without previous toplevel
record</>, and incorrect reporting of a transaction's commit time.
</para>
</listitem>
<listitem>
<para>
Fix planner error with nested security barrier views when the outer
view has a <literal>WHERE</> clause containing a correlated subquery
(Dean Rasheed)
</para>
</listitem>
<listitem>
<para>
Fix corner-case crash due to trying to free <function>localeconv()</>
output strings more than once (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix parsing of affix files for <literal>ispell</> dictionaries
(Tom Lane)
</para>
<para>
The code could go wrong if the affix file contained any characters
whose byte length changes during case-folding, for
example <literal>I</> in Turkish UTF8 locales.
</para>
</listitem>
<listitem>
<para>
Avoid use of <function>sscanf()</> to parse <literal>ispell</>
dictionary files (Artur Zakirov)
</para>
<para>
This dodges a portability problem on FreeBSD-derived platforms
(including macOS).
</para>
</listitem>
<listitem>
<para>
Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an
AVX2-capable CPU and a Postgres build done with Visual Studio 2013
(Christian Ullrich)
</para>
<para>
This is a workaround for a bug in Visual Studio 2013's runtime
library, which Microsoft have stated they will not fix in that
version.
</para>
</listitem>
<listitem>
<para>
Fix <application>psql</>'s tab completion logic to handle multibyte
characters properly (Kyotaro Horiguchi, Robert Haas)
</para>
</listitem>
<listitem>
<para>
Fix <application>psql</>'s tab completion for
<literal>SECURITY LABEL</> (Tom Lane)
</para>
<para>
Pressing TAB after <literal>SECURITY LABEL</> might cause a crash
or offering of inappropriate keywords.
</para>
</listitem>
<listitem>
<para>
Make <application>pg_ctl</> accept a wait timeout from the
<envar>PGCTLTIMEOUT</> environment variable, if none is specified on
the command line (Noah Misch)
</para>
<para>
This eases testing of slower buildfarm members by allowing them
to globally specify a longer-than-normal timeout for postmaster
startup and shutdown.
</para>
</listitem>
<listitem>
<para>
Fix incorrect test for Windows service status
in <application>pg_ctl</> (Manuel Mathar)
</para>
<para>
The previous set of minor releases attempted to
fix <application>pg_ctl</> to properly determine whether to send log
messages to Window's Event Log, but got the test backwards.
</para>
</listitem>
<listitem>
<para>
Fix <application>pgbench</> to correctly handle the combination
of <literal>-C</> and <literal>-M prepared</> options (Tom Lane)
</para>
</listitem>
<listitem>
<para>
In <application>pg_upgrade</>, skip creating a deletion script when
the new data directory is inside the old data directory (Bruce
Momjian)
</para>
<para>
Blind application of the script in such cases would result in loss of
the new data directory.
</para>
</listitem>
<listitem>
<para>
In PL/Perl, properly translate empty Postgres arrays into empty Perl
arrays (Alex Hunsaker)
</para>
</listitem>
<listitem>
<para>
Make PL/Python cope with function names that aren't valid Python
identifiers (Jim Nasby)
</para>
</listitem>
<listitem>
<para>
Fix multiple mistakes in the statistics returned
by <filename>contrib/pgstattuple</>'s <function>pgstatindex()</>
function (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Remove dependency on <literal>psed</> in MSVC builds, since it's no
longer provided by core Perl (Michael Paquier, Andrew Dunstan)
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2016c
for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia
(Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus
historical corrections for Lithuania, Moldova, and Russia
(Kaliningrad, Samara, Volgograd).
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-6">
<title>Release 9.4.6</title>
<note>
<title>Release Date</title>
<simpara>2016-02-11</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.5.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.6</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading an installation that contains any GIN
indexes that use the (non-default) <literal>jsonb_path_ops</> operator
class, see the first changelog entry below.
</para>
<para>
Also, if you are upgrading from a version earlier than 9.4.4,
see <xref linkend="release-9-4-4">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b23af4587] 2015-11-05 18:15:48 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [4d867458f] 2015-11-05 18:15:48 -0500
Branch: REL9_4_STABLE [788e35ac0] 2015-11-05 18:15:48 -0500
-->
<listitem>
<para>
Fix inconsistent hash calculations in <literal>jsonb_path_ops</> GIN
indexes (Tom Lane)
</para>
<para>
When processing <type>jsonb</> values that contain both scalars and
sub-objects at the same nesting level, for example an array containing
both scalars and sub-arrays, key hash values could be calculated
differently than they would be for the same key in a different context.
This could result in queries not finding entries that they should find.
Fixing this means that existing indexes may now be inconsistent with the
new hash calculation code. Users
should <command>REINDEX</> <literal>jsonb_path_ops</> GIN indexes after
installing this update to make sure that all searches work as expected.
</para>
</listitem>
<listitem>
<para>
Fix infinite loops and buffer-overrun problems in regular expressions
(Tom Lane)
</para>
<para>
Very large character ranges in bracket expressions could cause
infinite loops in some cases, and memory overwrites in other cases.
(CVE-2016-0773)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7e2a18a91] 2015-10-06 17:15:52 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [02580df6c] 2015-10-06 17:15:27 -0400
Branch: REL9_4_STABLE [3d701277f] 2015-10-06 17:15:27 -0400
Branch: REL9_3_STABLE [31bc563b9] 2015-10-06 17:15:27 -0400
Branch: REL9_2_STABLE [3d10f3970] 2015-10-06 17:15:27 -0400
Branch: REL9_1_STABLE [dea6da132] 2015-10-06 17:15:27 -0400
-->
<listitem>
<para>
Perform an immediate shutdown if the <filename>postmaster.pid</> file
is removed (Tom Lane)
</para>
<para>
The postmaster now checks every minute or so
that <filename>postmaster.pid</> is still there and still contains its
own PID. If not, it performs an immediate shutdown, as though it had
received <systemitem>SIGQUIT</>. The main motivation for this change
is to ensure that failed buildfarm runs will get cleaned up without
manual intervention; but it also serves to limit the bad effects if a
DBA forcibly removes <filename>postmaster.pid</> and then starts a new
postmaster.
</para>
</listitem>
<!--
Author: Kevin Grittner <kgrittn@postgresql.org>
Branch: master [585e2a3b1] 2015-10-31 14:43:34 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [50ca917d9] 2015-10-31 14:42:46 -0500
Branch: REL9_4_STABLE [1d95617f7] 2015-10-31 14:45:15 -0500
Branch: REL9_3_STABLE [18479293c] 2015-10-31 14:46:57 -0500
Branch: REL9_2_STABLE [caff7fc3f] 2015-10-31 14:36:37 -0500
Branch: REL9_1_STABLE [08322daed] 2015-10-31 14:36:58 -0500
-->
<listitem>
<para>
In <literal>SERIALIZABLE</> transaction isolation mode, serialization
anomalies could be missed due to race conditions during insertions
(Kevin Grittner, Thomas Munro)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [f54d0629e] 2015-12-12 14:17:39 +0100
Branch: REL9_5_STABLE Release: REL9_5_0 [ada9c09ae] 2015-12-12 14:19:19 +0100
Branch: REL9_4_STABLE [d638aeef6] 2015-12-12 14:19:23 +0100
Branch: REL9_3_STABLE [9037bdc88] 2015-12-12 14:19:25 +0100
Branch: REL9_2_STABLE [a15ad6708] 2015-12-12 14:19:51 +0100
Branch: REL9_1_STABLE [5f9a86b35] 2015-12-12 14:19:29 +0100
-->
<listitem>
<para>
Fix failure to emit appropriate WAL records when doing <literal>ALTER
TABLE ... SET TABLESPACE</> for unlogged relations (Michael Paquier,
Andres Freund)
</para>
<para>
Even though the relation's data is unlogged, the move must be logged or
the relation will be inaccessible after a standby is promoted to master.
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [e3f4cfc7a] 2015-12-10 16:29:26 +0100
Branch: REL9_5_STABLE Release: REL9_5_0 [5b51805fe] 2015-12-10 16:39:25 +0100
Branch: REL9_4_STABLE [c6a67bbc7] 2015-12-10 16:29:26 +0100
Branch: REL9_3_STABLE [b19405a44] 2015-12-10 16:29:27 +0100
Branch: REL9_2_STABLE [2de281da2] 2015-12-10 16:29:27 +0100
Branch: REL9_1_STABLE [3199c13fc] 2015-12-10 16:29:27 +0100
-->
<listitem>
<para>
Fix possible misinitialization of unlogged relations at the end of
crash recovery (Andres Freund, Michael Paquier)
</para>
</listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [263c19572] 2015-12-13 16:46:56 +0100
Branch: REL9_5_STABLE Release: REL9_5_0 [a9c56ff0e] 2015-12-13 16:43:35 +0100
Branch: REL9_4_STABLE [61c7bee21] 2015-12-13 16:43:52 +0100
Branch: REL9_3_STABLE [a1fb84990] 2015-12-13 16:44:04 +0100
-->
<listitem>
<para>
Ensure walsender slots are fully re-initialized when being re-used
(Magnus Hagander)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [074c5cfbf] 2015-11-20 14:55:47 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [a35c5b7c1] 2015-11-20 14:55:28 -0500
Branch: REL9_4_STABLE [47ea4614e] 2015-11-20 14:55:28 -0500
Branch: REL9_3_STABLE [64349f1d2] 2015-11-20 14:55:29 -0500
Branch: REL9_2_STABLE [c49279dfd] 2015-11-20 14:55:29 -0500
Branch: REL9_1_STABLE [60ba32cb5] 2015-11-20 14:55:29 -0500
-->
<listitem>
<para>
Fix <command>ALTER COLUMN TYPE</> to reconstruct inherited check
constraints properly (Tom Lane)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL9_4_STABLE [d07afa42d] 2015-12-21 19:49:15 -0300
Branch: REL9_3_STABLE [bc72c3b3f] 2015-12-21 19:49:15 -0300
Branch: REL9_2_STABLE [f9643d0d6] 2015-12-21 19:49:15 -0300
Branch: REL9_1_STABLE [7e29e7f55] 2015-12-21 19:49:15 -0300
-->
<listitem>
<para>
Fix <command>REASSIGN OWNED</> to change ownership of composite types
properly (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: REL9_4_STABLE [2c8ae6442] 2015-12-21 19:16:15 -0300
Branch: REL9_3_STABLE [62e6eba8d] 2015-12-21 19:16:15 -0300
Branch: REL9_2_STABLE [7af3dd540] 2015-12-21 19:16:15 -0300
Branch: REL9_1_STABLE [ab14c1383] 2015-12-21 19:16:15 -0300
-->
<listitem>
<para>
Fix <command>REASSIGN OWNED</> and <command>ALTER OWNER</> to correctly
update granted-permissions lists when changing owners of data types,
foreign data wrappers, or foreign servers (Bruce Momjian,
Álvaro Herrera)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [8c1615531] 2015-12-11 18:39:09 -0300
Branch: REL9_5_STABLE Release: REL9_5_0 [31f88a12a] 2015-12-11 18:39:09 -0300
Branch: REL9_4_STABLE [1f8757ad8] 2015-12-11 18:39:09 -0300
Branch: REL9_3_STABLE [4626245bc] 2015-12-11 18:39:09 -0300
Branch: REL9_2_STABLE [629842a8e] 2015-12-11 18:39:09 -0300
Branch: REL9_1_STABLE [f44c5203b] 2015-12-11 18:39:09 -0300
-->
<listitem>
<para>
Fix <command>REASSIGN OWNED</> to ignore foreign user mappings,
rather than fail (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [6f8cb1e23] 2015-12-21 10:34:14 -0500
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<listitem>
<para>
Fix possible crash after doing query rewrite for an updatable view
(Stephen Frost)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [acfcd45ca] 2015-12-11 14:22:20 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [564c19e86] 2015-12-11 14:22:20 -0500
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Branch: master [7e19db0c0] 2015-12-07 17:42:11 -0500
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Branch: REL9_3_STABLE [0a34ff7e9] 2015-12-07 17:41:45 -0500
-->
<listitem>
<para>
Fix planner's handling of <literal>LATERAL</> references (Tom
Lane)
</para>
<para>
This fixes some corner cases that led to <quote>failed to build any
N-way joins</> or <quote>could not devise a query plan</> planner
failures.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3c93a60f6] 2016-01-01 13:42:21 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [d932391fd] 2016-01-01 13:42:30 -0500
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<listitem>
<para>
Add more defenses against bad planner cost estimates for GIN index
scans when the index's internal statistics are very out-of-date
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7fb008c5e] 2015-12-01 16:24:34 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [e9986a811] 2015-12-01 16:24:34 -0500
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-->
<listitem>
<para>
Make planner cope with hypothetical GIN indexes suggested by an index
advisor plug-in (Julien Rouhaud)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8004953b5] 2015-11-16 13:45:17 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [34d4f49bb] 2015-11-16 13:45:17 -0500
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<listitem>
<para>
Speed up generation of unique table aliases in <command>EXPLAIN</> and
rule dumping, and ensure that generated aliases do not
exceed <literal>NAMEDATALEN</> (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [7745bc352] 2015-11-15 14:41:09 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [0489a048d] 2015-11-15 14:41:09 -0500
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-->
<listitem>
<para>
Fix dumping of whole-row Vars in <literal>ROW()</>
and <literal>VALUES()</> lists (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d43554258] 2015-10-20 11:07:04 -0700
Branch: REL9_5_STABLE Release: REL9_5_0 [5fb20a5ba] 2015-10-20 11:07:05 -0700
Branch: REL9_4_STABLE [4f33572ee] 2015-10-20 11:06:24 -0700
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<listitem>
<para>
Translation of minus-infinity dates and timestamps to <type>json</>
or <type>jsonb</> incorrectly rendered them as plus-infinity (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5f10b7a60] 2015-11-17 15:46:47 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [80be41979] 2015-11-17 15:46:54 -0500
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-->
<listitem>
<para>
Fix possible internal overflow in <type>numeric</> division
(Dean Rasheed)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a43b4ab11] 2015-11-07 12:43:24 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [44fc25153] 2015-11-07 12:43:24 -0500
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-->
<listitem>
<para>
Fix enforcement of restrictions inside parentheses within regular
expression lookahead constraints (Tom Lane)
</para>
<para>
Lookahead constraints aren't allowed to contain backrefs, and
parentheses within them are always considered non-capturing, according
to the manual. However, the code failed to handle these cases properly
inside a parenthesized subexpression, and would give unexpected
results.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9f1e642d5] 2015-10-19 13:54:53 -0700
Branch: REL9_5_STABLE Release: REL9_5_0 [43e36f8dd] 2015-10-19 13:54:53 -0700
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-->
<listitem>
<para>
Conversion of regular expressions to indexscan bounds could produce
incorrect bounds from regexps containing lookahead constraints
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [48789c5d2] 2015-10-16 15:55:58 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [0889e1857] 2015-10-16 15:56:00 -0400
Branch: REL9_4_STABLE [b6eb5fc40] 2015-10-16 14:14:41 -0400
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Branch: REL9_1_STABLE [d394f12c0] 2015-10-16 14:14:41 -0400
-->
<listitem>
<para>
Fix regular-expression compiler to handle loops of constraint arcs
(Tom Lane)
</para>
<para>
The code added for CVE-2007-4772 was both incomplete, in that it didn't
handle loops involving more than one state, and incorrect, in that it
could cause assertion failures (though there seem to be no bad
consequences of that in a non-assert build). Multi-state loops would
cause the compiler to run until the query was canceled or it reached
the too-many-states error condition.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [538b3b8b3] 2015-10-16 15:55:59 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [e91cfdead] 2015-10-16 15:56:00 -0400
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-->
<listitem>
<para>
Improve memory-usage accounting in regular-expression compiler
(Tom Lane)
</para>
<para>
This causes the code to emit <quote>regular expression is too
complex</> errors in some cases that previously used unreasonable
amounts of time and memory.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6a7153661] 2015-10-16 15:55:59 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [1bb0fbca3] 2015-10-16 15:56:00 -0400
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Branch: REL9_1_STABLE [067f96fe3] 2015-10-16 15:11:49 -0400
Branch: master [f5b7d103b] 2015-10-16 15:55:59 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [e9cf3dc30] 2015-10-16 15:56:00 -0400
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Branch: REL9_1_STABLE [5503e6e0f] 2015-10-16 14:58:11 -0400
Branch: master [579840ca0] 2015-10-16 15:55:59 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [cff9e0659] 2015-10-16 15:56:00 -0400
Branch: REL9_4_STABLE [bdde29e1c] 2015-10-16 14:43:18 -0400
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Branch: REL9_2_STABLE [a2ad467ae] 2015-10-16 14:43:18 -0400
Branch: REL9_1_STABLE [b00c79b5b] 2015-10-16 14:43:18 -0400
-->
<listitem>
<para>
Improve performance of regular-expression compiler (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make <literal>%h</> and <literal>%r</> escapes
in <varname>log_line_prefix</> work for messages emitted due
to <varname>log_connections</> (Tom Lane)
</para>
<para>
Previously, <literal>%h</>/<literal>%r</> started to work just after a
new session had emitted the <quote>connection received</> log message;
now they work for that message too.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [869f693a3] 2015-10-13 11:21:33 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [39ac29394] 2015-10-13 11:21:33 -0400
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Branch: REL9_1_STABLE [b0d858359] 2015-10-13 11:21:33 -0400
-->
<listitem>
<para>
On Windows, ensure the shared-memory mapping handle gets closed in
child processes that don't need it (Tom Lane, Amit Kapila)
</para>
<para>
This oversight resulted in failure to recover from crashes
whenever <varname>logging_collector</> is turned on.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_4_STABLE [add6d821b] 2016-01-04 17:41:33 -0500
Branch: REL9_3_STABLE [0f527f73b] 2016-01-04 17:41:33 -0500
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-->
<listitem>
<para>
Fix possible failure to detect socket EOF in non-blocking mode on
Windows (Tom Lane)
</para>
<para>
It's not entirely clear whether this problem can happen in pre-9.5
branches, but if it did, the symptom would be that a walsender process
would wait indefinitely rather than noticing a loss of connection.
</para>
</listitem>
<listitem>
<para>
Avoid leaking a token handle during SSPI authentication
(Christian Ullrich)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2ec477dc8] 2015-12-16 16:59:35 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [f1c152866] 2015-12-16 16:58:55 -0500
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Branch: master [aee7705be] 2015-12-17 16:55:23 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [5ec0aad01] 2015-12-17 16:55:33 -0500
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Branch: REL9_1_STABLE [db462a44e] 2015-12-17 16:55:51 -0500
-->
<listitem>
<para>
In <application>psql</>, ensure that <application>libreadline</>'s idea
of the screen size is updated when the terminal window size changes
(Merlin Moncure)
</para>
<para>
Previously, <application>libreadline</> did not notice if the window
was resized during query output, leading to strange behavior during
later input of multiline queries.
</para>
</listitem>
<listitem>
<para>
Fix <application>psql</>'s <literal>\det</> command to interpret its
pattern argument the same way as other <literal>\d</> commands with
potentially schema-qualified patterns do (Reece Hart)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c5ef8ce53] 2015-11-25 17:31:53 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [55a2cc844] 2015-11-25 17:31:53 -0500
Branch: REL9_4_STABLE [3d357b48f] 2015-11-25 17:31:53 -0500
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-->
<listitem>
<para>
Avoid possible crash in <application>psql</>'s <literal>\c</> command
when previous connection was via Unix socket and command specifies a
new hostname and same username (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6bcce2580] 2015-10-12 18:30:36 -0400
Branch: REL9_5_STABLE Release: REL9_5_0 [a151a5c38] 2015-10-12 18:30:36 -0400
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Branch: REL9_1_STABLE [c869a7d5b] 2015-10-12 18:30:37 -0400
-->
<listitem>
<para>
In <literal>pg_ctl start -w</>, test child process status directly
rather than relying on heuristics (Tom Lane, Michael Paquier)
</para>
<para>
Previously, <application>pg_ctl</> relied on an assumption that the new
postmaster would always create <filename>postmaster.pid</> within five
seconds. But that can fail on heavily-loaded systems,
causing <application>pg_ctl</> to report incorrectly that the
postmaster failed to start.
</para>
<para>
Except on Windows, this change also means that a <literal>pg_ctl start
-w</> done immediately after another such command will now reliably
fail, whereas previously it would report success if done within two
seconds of the first command.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [fed19f312] 2015-11-08 17:28:53 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [bdb42bac3] 2015-11-08 17:29:47 -0500
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-->
<listitem>
<para>
In <literal>pg_ctl start -w</>, don't attempt to use a wildcard listen
address to connect to the postmaster (Kondo Yuta)
</para>
<para>
On Windows, <application>pg_ctl</> would fail to detect postmaster
startup if <varname>listen_addresses</> is set to <literal>0.0.0.0</>
or <literal>::</>, because it would try to use that value verbatim as
the address to connect to, which doesn't work. Instead assume
that <literal>127.0.0.1</> or <literal>::1</>, respectively, is the
right thing to use.
</para>
</listitem>
<listitem>
<para>
In <application>pg_ctl</> on Windows, check service status to decide
where to send output, rather than checking if standard output is a
terminal (Michael Paquier)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [00cdd8352] 2015-11-21 20:21:31 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [5f5e68b08] 2015-11-21 20:21:32 -0500
Branch: REL9_4_STABLE [7acad9546] 2015-11-21 20:22:39 -0500
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Branch: REL9_2_STABLE [b054ca031] 2015-11-21 20:21:32 -0500
Branch: REL9_1_STABLE [8f1559aa5] 2015-11-21 20:21:32 -0500
Branch: REL9_2_STABLE [05c9bc063] 2015-11-23 00:32:01 -0500
Branch: REL9_1_STABLE [6df62ef43] 2015-11-23 00:32:01 -0500
-->
<listitem>
<para>
In <application>pg_dump</> and <application>pg_basebackup</>, adopt
the GNU convention for handling tar-archive members exceeding 8GB
(Tom Lane)
</para>
<para>
The POSIX standard for <literal>tar</> file format does not allow
archive member files to exceed 8GB, but most modern implementations
of <application>tar</> support an extension that fixes that. Adopt
this extension so that <application>pg_dump</> with <option>-Ft</> no
longer fails on tables with more than 8GB of data, and so
that <application>pg_basebackup</> can handle files larger than 8GB.
In addition, fix some portability issues that could cause failures for
members between 4GB and 8GB on some platforms. Potentially these
problems could cause unrecoverable data loss due to unreadable backup
files.
</para>
</listitem>
<listitem>
<para>
Fix assorted corner-case bugs in <application>pg_dump</>'s processing
of extension member objects (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make <application>pg_dump</> mark a view's triggers as needing to be
processed after its rule, to prevent possible failure during
parallel <application>pg_restore</> (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c7e27becd] 2016-01-01 15:27:53 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [404c45bac] 2016-01-01 15:27:53 -0500
Branch: REL9_4_STABLE [f9b3b3fec] 2016-01-01 15:27:53 -0500
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Branch: REL9_2_STABLE [69cfe15b5] 2016-01-01 15:27:53 -0500
Branch: REL9_1_STABLE [85dbc46bd] 2016-01-01 15:27:53 -0500
Branch: master [b416c0bb6] 2016-01-02 19:04:45 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [b01828e97] 2016-01-02 19:04:45 -0500
Branch: REL9_4_STABLE [aab4b73bd] 2016-01-02 19:04:45 -0500
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Branch: REL9_1_STABLE [e4959fb5c] 2016-01-02 19:04:45 -0500
-->
<listitem>
<para>
Ensure that relation option values are properly quoted
in <application>pg_dump</> (Kouhei Sutou, Tom Lane)
</para>
<para>
A reloption value that isn't a simple identifier or number could lead
to dump/reload failures due to syntax errors in CREATE statements
issued by <application>pg_dump</>. This is not an issue with any
reloption currently supported by core <productname>PostgreSQL</>, but
extensions could allow reloptions that cause the problem.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1aa41e3ea] 2015-12-23 14:25:53 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [a21994c1b] 2015-12-23 14:25:31 -0500
Branch: REL9_4_STABLE [f56802a2d] 2015-12-23 14:25:31 -0500
Branch: REL9_3_STABLE [534a4159c] 2015-12-23 14:25:31 -0500
-->
<listitem>
<para>
Avoid repeated password prompts during parallel <application>pg_dump</>
(Zeus Kronion)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [025106e31] 2015-11-14 11:47:12 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [fae58d5be] 2015-11-14 11:47:11 -0500
Branch: REL9_4_STABLE [87cdfeb18] 2015-11-14 11:47:11 -0500
Branch: REL9_3_STABLE [a75efb483] 2015-11-14 11:47:11 -0500
Branch: REL9_2_STABLE [b4c4220ed] 2015-11-14 11:47:11 -0500
Branch: REL9_1_STABLE [bdcbc2b47] 2015-11-14 11:47:11 -0500
Branch: master [13b30c16f] 2015-11-24 17:18:28 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [b17dbf262] 2015-11-24 17:18:28 -0500
Branch: REL9_4_STABLE [f91c4e326] 2015-11-24 17:18:28 -0500
Branch: REL9_3_STABLE [6638c9aaf] 2015-11-24 17:18:27 -0500
Branch: REL9_2_STABLE [0ca3c51e5] 2015-11-24 17:18:27 -0500
Branch: REL9_1_STABLE [c36064e43] 2015-11-24 17:18:27 -0500
-->
<listitem>
<para>
Fix <application>pg_upgrade</>'s file-copying code to handle errors
properly on Windows (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Install guards in <application>pgbench</> against corner-case overflow
conditions during evaluation of script-specified division or modulo
operators (Fabien Coelho, Michael Paquier)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [fc995bfdb] 2015-12-28 10:50:35 -0300
Branch: REL9_5_STABLE Release: REL9_5_0 [c3e068b26] 2015-12-28 10:50:35 -0300
Branch: REL9_4_STABLE [f98bc20dd] 2015-12-28 10:50:35 -0300
Branch: REL9_3_STABLE [7533d5d35] 2015-12-28 10:50:35 -0300
Branch: REL9_2_STABLE [4fb9e6109] 2015-12-28 10:50:35 -0300
-->
<listitem>
<para>
Fix failure to localize messages emitted
by <application>pg_receivexlog</> and <application>pg_recvlogical</>
(Ioseph Kim)
</para>
</listitem>
<listitem>
<para>
Avoid dump/reload problems when using both <application>plpython2</>
and <application>plpython3</> (Tom Lane)
</para>
<para>
In principle, both versions of <application>PL/Python</> can be used in
the same database, though not in the same session (because the two
versions of <application>libpython</> cannot safely be used concurrently).
However, <application>pg_restore</> and <application>pg_upgrade</> both
do things that can fall foul of the same-session restriction. Work
around that by changing the timing of the check.
</para>
</listitem>
<listitem>
<para>
Fix <application>PL/Python</> regression tests to pass with Python 3.5
(Peter Eisentraut)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c40591885] 2015-11-12 13:03:52 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [747854f01] 2015-11-12 13:03:52 -0500
Branch: REL9_4_STABLE [40879a92b] 2015-11-12 13:03:52 -0500
Branch: REL9_3_STABLE [db6e8e162] 2015-11-12 13:03:53 -0500
-->
<listitem>
<para>
Fix premature clearing of <application>libpq</>'s input buffer when
socket EOF is seen (Tom Lane)
</para>
<para>
This mistake caused <application>libpq</> to sometimes not report the
backend's final error message before reporting <quote>server closed the
connection unexpectedly</>.
</para>
</listitem>
<listitem>
<para>
Prevent certain <application>PL/Java</> parameters from being set by
non-superusers (Noah Misch)
</para>
<para>
This change mitigates a <application>PL/Java</> security bug
(CVE-2016-0766), which was fixed in <application>PL/Java</> by marking
these parameters as superuser-only. To fix the security hazard for
sites that update <productname>PostgreSQL</> more frequently
than <application>PL/Java</>, make the core code aware of them also.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [7b96bf445] 2015-12-14 18:19:10 +0200
Branch: REL9_5_STABLE Release: REL9_5_0 [34d136f92] 2015-12-14 18:24:58 +0200
Branch: REL9_4_STABLE [affae5e98] 2015-12-14 18:40:51 +0200
Branch: REL9_3_STABLE [dee1ed54f] 2015-12-14 18:52:29 +0200
Branch: REL9_2_STABLE [1e23caae3] 2015-12-14 18:41:11 +0200
Branch: REL9_1_STABLE [4b58ded74] 2015-12-14 18:48:49 +0200
-->
<listitem>
<para>
Improve <application>libpq</>'s handling of out-of-memory situations
(Michael Paquier, Amit Kapila, Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: REL9_5_STABLE Release: REL9_5_0 [937261454] 2015-10-18 10:15:18 +0200
Branch: REL9_4_STABLE [a850d7136] 2015-10-18 10:16:36 +0200
Branch: REL9_3_STABLE [defd2ecf4] 2015-10-18 10:16:49 +0200
Branch: REL9_2_STABLE [8f67643be] 2015-10-18 10:17:01 +0200
Branch: REL9_1_STABLE [a9bcd8370] 2015-10-18 10:17:12 +0200
-->
<listitem>
<para>
Fix order of arguments
in <application>ecpg</>-generated <literal>typedef</> statements
(Michael Meskes)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [db4a5cfc7] 2015-12-01 11:42:25 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [c79bdc990] 2015-12-01 11:42:35 -0500
Branch: REL9_4_STABLE [346cc2f01] 2015-12-01 11:42:39 -0500
Branch: REL9_3_STABLE [3e6e98c5a] 2015-12-01 11:42:43 -0500
Branch: REL9_2_STABLE [74cf6defa] 2015-12-01 11:42:47 -0500
Branch: REL9_1_STABLE [84387496f] 2015-12-01 11:42:52 -0500
-->
<listitem>
<para>
Use <literal>%g</> not <literal>%f</> format
in <application>ecpg</>'s <function>PGTYPESnumeric_from_double()</>
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Fix <application>ecpg</>-supplied header files to not contain comments
continued from a preprocessor directive line onto the next line
(Michael Meskes)
</para>
<para>
Such a comment is rejected by <application>ecpg</>. It's not yet clear
whether <application>ecpg</> itself should be changed.
</para>
</listitem>
<listitem>
<para>
Fix <function>hstore_to_json_loose()</>'s test for whether
an <type>hstore</> value can be converted to a JSON number (Tom Lane)
</para>
<para>
Previously this function could be fooled by non-alphanumeric trailing
characters, leading to emitting syntactically-invalid JSON.
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [743229a67] 2015-12-27 13:03:19 -0300
Branch: REL9_5_STABLE Release: REL9_5_0 [c886c30cc] 2015-12-27 13:03:19 -0300
Branch: REL9_4_STABLE [0a29cf693] 2015-12-27 13:03:19 -0300
Branch: REL9_3_STABLE [0244677cf] 2015-12-27 13:03:19 -0300
Branch: REL9_2_STABLE [51dd54ba7] 2015-12-27 13:03:19 -0300
Branch: REL9_1_STABLE [1b6102eb7] 2015-12-27 13:03:19 -0300
-->
<listitem>
<para>
Ensure that <filename>contrib/pgcrypto</>'s <function>crypt()</>
function can be interrupted by query cancel (Andreas Karlsson)
</para>
</listitem>
<listitem>
<para>
In <filename>contrib/postgres_fdw</>, fix bugs triggered by use
of <literal>tableoid</> in data-modifying commands (Etsuro Fujita,
Robert Haas)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [32f15d05c] 2015-11-18 17:45:05 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [659d47292] 2015-11-18 17:45:05 -0500
Branch: REL9_4_STABLE [d5bb7c6f6] 2015-11-18 17:45:05 -0500
Branch: REL9_3_STABLE [ae81d4fb1] 2015-11-18 17:45:05 -0500
Branch: REL9_2_STABLE [6e1d26f1f] 2015-11-18 17:45:06 -0500
Branch: REL9_1_STABLE [b4afc39f7] 2015-11-18 17:45:06 -0500
Branch: master [9c779c49e] 2015-12-10 10:19:13 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [2355faae0] 2015-12-10 10:19:18 -0500
Branch: REL9_4_STABLE [ee0df4d77] 2015-12-10 10:19:22 -0500
Branch: REL9_3_STABLE [b3e377a00] 2015-12-10 10:19:27 -0500
Branch: REL9_2_STABLE [7f94a5c10] 2015-12-10 10:19:31 -0500
-->
<listitem>
<para>
Accept <application>flex</> versions later than 2.5.x
(Tom Lane, Michael Paquier)
</para>
<para>
Now that flex 2.6.0 has been released, the version checks in our build
scripts needed to be adjusted.
</para>
</listitem>
<listitem>
<para>
Improve reproducibility of build output by ensuring filenames are given
to the linker in a fixed order (Christoph Berg)
</para>
<para>
This avoids possible bitwise differences in the produced executable
files from one build to the next.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [dccf8e9e6] 2015-12-11 16:15:05 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [6061aa8ed] 2015-12-11 16:15:06 -0500
Branch: REL9_4_STABLE [423697e3d] 2015-12-11 16:14:36 -0500
Branch: REL9_3_STABLE [1ebe75a2c] 2015-12-11 16:14:40 -0500
Branch: REL9_2_STABLE [98467b35d] 2015-12-11 16:14:44 -0500
Branch: REL9_1_STABLE [2a37a103b] 2015-12-11 16:14:48 -0500
-->
<listitem>
<para>
Install our <filename>missing</> script where PGXS builds can find it
(Jim Nasby)
</para>
<para>
This allows sane behavior in a PGXS build done on a machine where build
tools such as <application>bison</> are missing.
</para>
</listitem>
<listitem>
<para>
Ensure that <filename>dynloader.h</> is included in the installed
header files in MSVC builds (Bruce Momjian, Michael Paquier)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [085423e3e] 2015-12-11 19:09:04 -0500
Branch: REL9_5_STABLE Release: REL9_5_0 [ea7f7d8b3] 2015-12-11 19:08:40 -0500
Branch: REL9_4_STABLE [09824cd99] 2015-12-11 19:08:40 -0500
Branch: REL9_3_STABLE [fee485815] 2015-12-11 19:08:40 -0500
Branch: REL9_2_STABLE [f5eebea8d] 2015-12-11 19:08:40 -0500
Branch: REL9_1_STABLE [386dcd539] 2015-12-11 19:08:40 -0500
-->
<listitem>
<para>
Add variant regression test expected-output file to match behavior of
current <application>libxml2</> (Tom Lane)
</para>
<para>
The fix for <application>libxml2</>'s CVE-2015-7499 causes it not to
output error context reports in some cases where it used to do so.
This seems to be a bug, but we'll probably have to live with it for
some time, so work around it.
</para>
</listitem>
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2016a for
DST law changes in Cayman Islands, Metlakatla, and Trans-Baikal
Territory (Zabaykalsky Krai), plus historical corrections for Pakistan.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-5">
<title>Release 9.4.5</title>
<note>
<title>Release Date</title>
<simpara>2015-10-08</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.4.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.5</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading from a version earlier than 9.4.4,
see <xref linkend="release-9-4-4">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [08fa47c48] 2015-10-05 10:06:29 -0400
Branch: REL9_5_STABLE [98f30d2e5] 2015-10-05 10:06:33 -0400
Branch: REL9_4_STABLE [16d58b5b5] 2015-10-05 10:06:34 -0400
Branch: REL9_3_STABLE [f8862172e] 2015-10-05 10:06:34 -0400
-->
<listitem>
<para>
Guard against stack overflows in <type>json</> parsing
(Oskari Saarenmaa)
</para>
<para>
If an application constructs PostgreSQL <type>json</>
or <type>jsonb</> values from arbitrary user input, the application's
users can reliably crash the PostgreSQL server, causing momentary
denial of service. (CVE-2015-5289)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [1d812c8b0] 2015-10-05 10:06:29 -0400
Branch: REL9_5_STABLE [4d6752277] 2015-10-05 10:06:33 -0400
Branch: REL9_4_STABLE [4d95419e8] 2015-10-05 10:06:34 -0400
Branch: REL9_3_STABLE [cc1210f0a] 2015-10-05 10:06:34 -0400
Branch: REL9_2_STABLE [56232f987] 2015-10-05 10:06:35 -0400
Branch: REL9_1_STABLE [48f6310bc] 2015-10-05 10:06:35 -0400
Branch: REL9_0_STABLE [188e081ef] 2015-10-05 10:06:36 -0400
-->
<listitem>
<para>
Fix <filename>contrib/pgcrypto</> to detect and report
too-short <function>crypt()</> salts (Josh Kupershmidt)
</para>
<para>
Certain invalid salt arguments crashed the server or disclosed a few
bytes of server memory. We have not ruled out the viability of
attacks that arrange for presence of confidential information in the
disclosed bytes, but they seem unlikely. (CVE-2015-5288)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c5454f99c] 2015-09-04 13:37:14 -0400
Branch: REL9_5_STABLE [a2538da89] 2015-09-04 13:37:16 -0400
Branch: REL9_4_STABLE [37d10c524] 2015-09-04 13:37:17 -0400
Branch: REL9_3_STABLE [9e9b310d8] 2015-09-04 13:36:50 -0400
Branch: REL9_2_STABLE [39ebb6466] 2015-09-04 13:36:50 -0400
Branch: REL9_1_STABLE [dae1c9480] 2015-09-04 13:36:50 -0400
Branch: REL9_0_STABLE [81ee435c4] 2015-09-04 13:36:50 -0400
-->
<listitem>
<para>
Fix subtransaction cleanup after a portal (cursor) belonging to an
outer subtransaction fails (Tom Lane, Michael Paquier)
</para>
<para>
A function executed in an outer-subtransaction cursor could cause an
assertion failure or crash by referencing a relation created within an
inner subtransaction.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [358cde320] 2015-08-02 20:08:10 +0300
Branch: REL9_5_STABLE [54f23a45f] 2015-08-02 20:08:50 +0300
Branch: REL9_4_STABLE [bab959906] 2015-08-02 20:09:05 +0300
-->
<listitem>
<para>
Fix possible deadlock during WAL insertion
when <varname>commit_delay</> is set (Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [c3e0ddd40] 2015-09-08 17:02:49 -0400
Branch: REL9_5_STABLE [9801bae21] 2015-09-08 17:02:53 -0400
Branch: REL9_4_STABLE [83d004904] 2015-09-08 17:02:56 -0400
Branch: REL9_3_STABLE [cb1b9b959] 2015-09-08 17:02:59 -0400
-->
<listitem>
<para>
Ensure all relations referred to by an updatable view are properly
locked during an update statement (Dean Rasheed)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL9_5_BR [5d1ff6bd5] 2015-06-25 14:39:05 -0400
Branch: REL9_4_STABLE [e118555cf] 2015-06-25 14:39:05 -0400
Branch: REL9_3_STABLE [834aa56ea] 2015-06-25 14:39:05 -0400
Branch: REL9_2_STABLE [88fab18a4] 2015-06-25 14:39:05 -0400
Branch: REL9_1_STABLE [a9b7bf82f] 2015-06-25 14:39:06 -0400
Branch: REL9_0_STABLE [45c69178b] 2015-06-25 14:39:06 -0400
-->
<listitem>
<para>
Fix insertion of relations into the relation cache <quote>init file</>
(Tom Lane)
</para>
<para>
An oversight in a patch in the most recent minor releases
caused <structname>pg_trigger_tgrelid_tgname_index</> to be omitted
from the init file. Subsequent sessions detected this, then deemed the
init file to be broken and silently ignored it, resulting in a
significant degradation in session startup time. In addition to fixing
the bug, install some guards so that any similar future mistake will be
more obvious.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [6e5d9f278] 2015-08-21 20:32:11 -0400
Branch: REL9_5_STABLE [68a14ca74] 2015-08-21 20:32:17 -0400
Branch: REL9_4_STABLE [fe939d950] 2015-08-21 20:32:26 -0400
Branch: REL9_3_STABLE [ea9892444] 2015-08-21 20:32:29 -0400
Branch: REL9_2_STABLE [d951d6065] 2015-08-21 20:32:33 -0400
Branch: REL9_1_STABLE [87b8c9e12] 2015-08-21 20:32:37 -0400
Branch: REL9_0_STABLE [7c57449fc] 2015-08-21 20:32:41 -0400
-->
<listitem>
<para>
Avoid O(N^2) behavior when inserting many tuples into a SPI query
result (Neil Conway)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [07e4d03fb] 2015-09-30 23:32:43 -0400
Branch: REL9_5_STABLE [8c8a834b1] 2015-09-30 23:32:23 -0400
Branch: REL9_4_STABLE [03f9b63e2] 2015-09-30 23:32:23 -0400
Branch: REL9_3_STABLE [aad86c518] 2015-09-30 23:32:23 -0400
Branch: REL9_2_STABLE [e4c00750a] 2015-09-30 23:32:23 -0400
Branch: REL9_1_STABLE [2bbe8a684] 2015-09-30 23:32:23 -0400
Branch: REL9_0_STABLE [2d4336cf8] 2015-09-30 23:32:23 -0400
-->
<listitem>
<para>
Improve <command>LISTEN</> startup time when there are many unread
notifications (Matt Newell)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2abfd9d5e] 2015-09-25 13:16:30 -0400
Branch: REL9_5_STABLE [c9645f757] 2015-09-25 13:16:30 -0400
Branch: REL9_4_STABLE [67d0f7a37] 2015-09-25 13:16:30 -0400
Branch: REL9_3_STABLE [1bcc9e60a] 2015-09-25 13:16:31 -0400
-->
<listitem>
<para>
Fix performance problem when a session alters large numbers of foreign
key constraints (Jan Wieck, Tom Lane)
</para>
<para>
This was seen primarily when restoring <application>pg_dump</> output
for databases with many thousands of tables.
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: REL9_4_STABLE [ab6084782] 2015-07-28 22:06:31 +0200
Branch: REL9_3_STABLE [48d23c72d] 2015-07-28 22:06:31 +0200
Branch: REL9_2_STABLE [2f91e7bb5] 2015-07-28 22:06:31 +0200
Branch: REL9_1_STABLE [624a3c9be] 2015-07-28 22:06:32 +0200
Branch: REL9_0_STABLE [444b2ebee] 2015-07-28 22:06:32 +0200
-->
<listitem>
<para>
Disable SSL renegotiation by default (Michael Paquier, Andres Freund)
</para>
<para>
While use of SSL renegotiation is a good idea in theory, we have seen
too many bugs in practice, both in the underlying OpenSSL library and
in our usage of it. Renegotiation will be removed entirely in 9.5 and
later. In the older branches, just change the default value
of <varname>ssl_renegotiation_limit</> to zero (disabled).
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [020235a57] 2015-09-24 14:53:32 +0200
Branch: REL9_5_STABLE [ef4fccd2b] 2015-09-24 14:53:33 +0200
Branch: REL9_4_STABLE [4ff753c91] 2015-09-24 14:53:33 +0200
Branch: REL9_3_STABLE [fee2275ae] 2015-09-24 14:53:33 +0200
Branch: REL9_2_STABLE [f12932dd4] 2015-09-24 14:53:33 +0200
Branch: REL9_1_STABLE [ff090bbb7] 2015-09-24 14:53:33 +0200
Branch: REL9_0_STABLE [078d471a9] 2015-09-24 14:53:33 +0200
Branch: master [2596d705b] 2015-10-05 11:53:43 +0200
Branch: REL9_5_STABLE [0577821b5] 2015-10-05 11:56:58 +0200
Branch: REL9_4_STABLE [13ac4c035] 2015-10-05 11:57:07 +0200
Branch: REL9_3_STABLE [393341714] 2015-10-05 11:57:11 +0200
Branch: REL9_2_STABLE [e07cfef34] 2015-10-05 11:57:15 +0200
Branch: REL9_1_STABLE [7116a3e98] 2015-10-05 11:57:20 +0200
Branch: REL9_0_STABLE [eeb0b7830] 2015-10-05 11:57:25 +0200
-->
<listitem>
<para>
Lower the minimum values of the <literal>*_freeze_max_age</> parameters
(Andres Freund)
</para>
<para>
This is mainly to make tests of related behavior less time-consuming,
but it may also be of value for installations with limited disk space.
</para>
</listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [369342cf7] 2015-08-04 12:58:54 -0400
Branch: REL9_5_STABLE [cd52e4a2b] 2015-08-04 13:05:43 -0400
Branch: REL9_4_STABLE [3a35ca5ad] 2015-08-04 13:05:48 -0400
Branch: REL9_3_STABLE [11ed4bab5] 2015-08-04 13:05:52 -0400
Branch: REL9_2_STABLE [5ef8e1114] 2015-08-04 13:05:58 -0400
Branch: REL9_1_STABLE [4e51ea8fd] 2015-08-04 13:06:03 -0400
Branch: REL9_0_STABLE [b09446ed7] 2015-08-04 13:12:03 -0400
-->
<listitem>
<para>
Limit the maximum value of <varname>wal_buffers</> to 2GB to avoid
server crashes (Josh Berkus)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_4_STABLE [1afc1fe9c] 2015-06-28 18:38:06 -0400
Branch: REL9_3_STABLE [5a56c2545] 2015-06-28 18:38:06 -0400
-->
<listitem>
<para>
Avoid logging complaints when a parameter that can only be set at
server start appears multiple times in <filename>postgresql.conf</>,
and fix counting of line numbers after an <literal>include_dir</>
directive (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [246693e5a] 2015-09-21 12:11:32 -0400
Branch: REL9_5_STABLE [3dfffac70] 2015-09-21 12:11:45 -0400
Branch: REL9_4_STABLE [fa9fc3a1b] 2015-09-21 12:11:49 -0400
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Branch: REL9_0_STABLE [a89781e34] 2015-09-21 12:12:16 -0400
-->
<listitem>
<para>
Fix rare internal overflow in multiplication of <type>numeric</> values
(Dean Rasheed)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [30cb12881] 2015-10-05 10:06:29 -0400
Branch: REL9_5_STABLE [acf0da1e6] 2015-10-05 10:06:33 -0400
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Branch: master [5976097c0] 2015-10-05 10:06:30 -0400
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Branch: REL9_2_STABLE [8dacb29ca] 2015-10-05 10:06:35 -0400
-->
<listitem>
<para>
Guard against hard-to-reach stack overflows involving record types,
range types, <type>json</>, <type>jsonb</>, <type>tsquery</>,
<type>ltxtquery</> and <type>query_int</> (Noah Misch)
</para>
</listitem>
<!--
Author: Greg Stark <stark@mit.edu>
Branch: master [258ee1b63] 2015-09-06 03:35:56 +0100
Branch: REL9_5_STABLE [c11100d0f] 2015-09-06 04:05:46 +0100
Branch: REL9_4_STABLE [b17ce6208] 2015-09-06 03:56:59 +0100
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Branch: REL9_0_STABLE [530d0c504] 2015-09-06 04:05:20 +0100
Branch: master [37239ef8c] 2015-09-07 20:41:29 +0100
Branch: REL9_5_STABLE [a12424028] 2015-09-07 20:47:41 +0100
Branch: REL9_4_STABLE [0198a8d82] 2015-09-07 20:47:37 +0100
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Branch: REL9_2_STABLE [af9d9e59c] 2015-09-07 20:47:29 +0100
Branch: REL9_1_STABLE [0252d7777] 2015-09-07 20:47:19 +0100
Branch: REL9_0_STABLE [92d956f51] 2015-09-07 20:47:06 +0100
-->
<listitem>
<para>
Fix handling of <literal>DOW</> and <literal>DOY</> in datetime input
(Greg Stark)
</para>
<para>
These tokens aren't meant to be used in datetime values, but previously
they resulted in opaque internal error messages rather
than <quote>invalid input syntax</>.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9fe8fe9c9] 2015-10-02 13:45:39 -0400
Branch: REL9_5_STABLE [bb704a781] 2015-10-02 13:45:39 -0400
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Branch: REL9_0_STABLE [d4f6488ec] 2015-10-02 13:45:39 -0400
-->
<listitem>
<para>
Add more query-cancel checks to regular expression matching (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b63fc2877] 2015-10-02 14:51:58 -0400
Branch: REL9_5_STABLE [20c627707] 2015-10-02 14:51:58 -0400
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Branch: REL9_0_STABLE [54b116d83] 2015-10-02 14:51:59 -0400
Branch: master [2e8cfcf4e] 2015-10-02 15:00:51 -0400
Branch: REL9_5_STABLE [bdc5d95b6] 2015-10-02 15:00:52 -0400
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Branch: REL9_0_STABLE [b875ca09f] 2015-10-02 15:00:52 -0400
-->
<listitem>
<para>
Add recursion depth protections to regular expression, <literal>SIMILAR
TO</>, and <literal>LIKE</> matching (Tom Lane)
</para>
<para>
Suitable search patterns and a low stack depth limit could lead to
stack-overrun crashes.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f2c4ffc33] 2015-10-02 14:26:36 -0400
Branch: REL9_5_STABLE [51f235931] 2015-10-02 14:26:36 -0400
Branch: REL9_4_STABLE [c0215b2cf] 2015-10-02 14:26:36 -0400
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Branch: REL9_1_STABLE [630154955] 2015-10-02 14:26:36 -0400
Branch: REL9_0_STABLE [2a8878289] 2015-10-02 14:26:36 -0400
-->
<listitem>
<para>
Fix potential infinite loop in regular expression execution (Tom Lane)
</para>
<para>
A search pattern that can apparently match a zero-length string, but
actually doesn't match because of a back reference, could lead to an
infinite loop.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f2c4ffc33] 2015-10-02 14:26:36 -0400
Branch: REL9_5_STABLE [51f235931] 2015-10-02 14:26:36 -0400
Branch: REL9_4_STABLE [c0215b2cf] 2015-10-02 14:26:36 -0400
Branch: REL9_3_STABLE [6b3810d0a] 2015-10-02 14:26:36 -0400
Branch: REL9_2_STABLE [483bbc9fe] 2015-10-02 14:26:36 -0400
-->
<listitem>
<para>
In regular expression execution, correctly record match data for
capturing parentheses within a quantifier even when the match is
zero-length (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8a0258c31] 2015-08-12 00:48:11 -0400
Branch: REL9_5_STABLE [c5bfcc18a] 2015-08-12 00:48:28 -0400
Branch: REL9_4_STABLE [a35a527f2] 2015-08-12 00:48:34 -0400
Branch: REL9_3_STABLE [a54875602] 2015-08-12 00:48:39 -0400
Branch: REL9_2_STABLE [234205a2e] 2015-08-12 00:48:44 -0400
Branch: REL9_1_STABLE [7a801ba8c] 2015-08-12 00:48:48 -0400
Branch: REL9_0_STABLE [7e23b63bd] 2015-08-12 00:48:54 -0400
-->
<listitem>
<para>
Fix low-memory failures in regular expression compilation
(Andreas Seltenreich)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d9c0c728a] 2015-09-18 13:55:17 -0400
Branch: REL9_5_STABLE [a39331fa5] 2015-09-18 13:55:17 -0400
Branch: REL9_4_STABLE [f7d896ab9] 2015-09-18 13:55:17 -0400
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Branch: REL9_1_STABLE [28c396134] 2015-09-18 13:55:17 -0400
Branch: REL9_0_STABLE [ba9eb293f] 2015-09-18 13:55:17 -0400
-->
<listitem>
<para>
Fix low-probability memory leak during regular expression execution
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ba51774d8] 2015-09-20 16:48:44 -0400
Branch: REL9_5_STABLE [3d3bc2905] 2015-09-20 16:48:44 -0400
Branch: REL9_4_STABLE [e32c5f118] 2015-09-20 16:48:44 -0400
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Branch: REL9_2_STABLE [ac0c71228] 2015-09-20 16:48:44 -0400
Branch: REL9_1_STABLE [553ce7e9a] 2015-09-20 16:48:44 -0400
Branch: REL9_0_STABLE [eed5bbc48] 2015-09-20 16:48:44 -0400
-->
<listitem>
<para>
Fix rare low-memory failure in lock cleanup during transaction abort
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8ea3e7a75] 2015-08-04 18:18:46 -0400
Branch: REL9_5_STABLE [e2035dc9a] 2015-08-04 18:18:46 -0400
Branch: REL9_4_STABLE [118c9bb8d] 2015-08-04 18:18:46 -0400
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Branch: REL9_2_STABLE [b6659a3b9] 2015-08-04 18:18:46 -0400
Branch: REL9_1_STABLE [9965aff1c] 2015-08-04 18:18:47 -0400
Branch: REL9_0_STABLE [bd327627f] 2015-08-04 18:18:47 -0400
-->
<listitem>
<para>
Fix <quote>unexpected out-of-memory situation during sort</> errors
when using tuplestores with small <varname>work_mem</> settings (Tom
Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9d6077abf] 2015-07-16 22:57:46 -0400
Branch: REL9_5_STABLE [fd415ffc9] 2015-07-16 22:57:46 -0400
Branch: REL9_4_STABLE [b8f368276] 2015-07-16 22:57:46 -0400
Branch: REL9_3_STABLE [730089d87] 2015-07-16 22:57:46 -0400
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Branch: REL9_1_STABLE [faef3dc28] 2015-07-16 22:57:46 -0400
Branch: REL9_0_STABLE [36522d627] 2015-07-16 22:57:46 -0400
-->
<listitem>
<para>
Fix very-low-probability stack overrun in <function>qsort</> (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_4_STABLE [ff4cbc1ff] 2015-10-04 14:16:59 -0400
Branch: REL9_3_STABLE [45dd7cdba] 2015-10-04 14:17:14 -0400
Branch: REL9_2_STABLE [fd3e3cf50] 2015-10-04 14:17:20 -0400
Branch: REL9_1_STABLE [a8168fbcb] 2015-10-04 14:17:24 -0400
Branch: REL9_0_STABLE [2647b245d] 2015-10-04 14:17:28 -0400
Branch: master [f2fc98fb8] 2015-10-04 15:55:07 -0400
Branch: REL9_5_STABLE [e5c94c7bb] 2015-10-04 15:55:07 -0400
Branch: REL9_4_STABLE [4075fc4b9] 2015-10-04 15:55:07 -0400
Branch: REL9_3_STABLE [0867e0ad5] 2015-10-04 15:55:07 -0400
Branch: REL9_2_STABLE [ebc7d928a] 2015-10-04 15:55:07 -0400
Branch: REL9_1_STABLE [d84cc40e4] 2015-10-04 15:55:07 -0400
Branch: REL9_0_STABLE [d637a899c] 2015-10-04 15:55:07 -0400
-->
<listitem>
<para>
Fix <quote>invalid memory alloc request size</> failure in hash joins
with large <varname>work_mem</> settings (Tomas Vondra, Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8693ebe37] 2015-07-30 12:11:23 -0400
Branch: REL9_5_STABLE [e91a1643a] 2015-07-30 12:11:23 -0400
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Branch: REL9_0_STABLE [54833c5e7] 2015-07-30 12:11:23 -0400
Branch: master [a6492ff89] 2015-07-31 19:26:33 -0400
Branch: REL9_5_STABLE [edf26ed03] 2015-07-31 19:26:33 -0400
Branch: REL9_4_STABLE [216977a7d] 2015-07-31 19:26:33 -0400
Branch: REL9_3_STABLE [a4df781c9] 2015-07-31 19:26:33 -0400
Branch: master [f69b4b949] 2015-08-01 20:57:41 -0400
Branch: REL9_5_STABLE [7968238eb] 2015-08-01 20:57:41 -0400
Branch: REL9_4_STABLE [e39a3b2ef] 2015-08-01 20:57:41 -0400
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Branch: REL9_1_STABLE [b9dfa07e8] 2015-08-01 20:57:41 -0400
Branch: REL9_0_STABLE [44679965f] 2015-08-01 20:57:41 -0400
Branch: master [85e5e222b] 2015-08-04 14:55:50 -0400
Branch: REL9_5_STABLE [a6f43986b] 2015-08-04 14:55:52 -0400
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Branch: master [6af9ee4c8] 2015-08-05 14:39:29 -0400
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Branch: REL9_0_STABLE [c084f613e] 2015-08-05 14:39:07 -0400
Branch: master [8703059c6] 2015-08-06 15:35:46 -0400
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Branch: master [cde35cf4a] 2015-08-06 20:14:53 -0400
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Branch: REL9_3_STABLE [0d4913509] 2015-08-06 20:14:37 -0400
Branch: master [bab163e12] 2015-08-06 22:14:27 -0400
Branch: REL9_5_STABLE [de0227d8a] 2015-08-06 22:14:28 -0400
Branch: REL9_4_STABLE [8c7bb0240] 2015-08-06 22:14:07 -0400
Branch: REL9_3_STABLE [de5edc660] 2015-08-06 22:14:07 -0400
Branch: master [89db83922] 2015-08-07 14:13:50 -0400
Branch: REL9_5_STABLE [085338822] 2015-08-07 14:13:51 -0400
Branch: REL9_4_STABLE [30b4ccdab] 2015-08-07 14:13:52 -0400
Branch: REL9_3_STABLE [868bfd1f3] 2015-08-07 14:13:39 -0400
Branch: master [4200a9286] 2015-08-10 17:18:17 -0400
Branch: REL9_5_STABLE [fda25b220] 2015-08-10 17:18:17 -0400
Branch: REL9_4_STABLE [7371ab74f] 2015-08-10 17:18:17 -0400
Branch: REL9_3_STABLE [f6d7a79f4] 2015-08-10 17:18:17 -0400
Branch: REL9_2_STABLE [54cea765c] 2015-08-10 17:18:17 -0400
Branch: master [cfe30a72f] 2015-08-12 21:19:03 -0400
Branch: REL9_5_STABLE [ec94bc147] 2015-08-12 21:19:04 -0400
Branch: REL9_4_STABLE [8cd3a7ada] 2015-08-12 21:19:05 -0400
Branch: REL9_3_STABLE [7950657a9] 2015-08-12 21:19:06 -0400
Branch: REL9_2_STABLE [866197d82] 2015-08-12 21:19:07 -0400
Branch: REL9_1_STABLE [4390ba7bf] 2015-08-12 21:19:09 -0400
Branch: REL9_0_STABLE [7b4b57fc4] 2015-08-12 21:19:10 -0400
-->
<listitem>
<para>
Fix assorted planner bugs (Tom Lane)
</para>
<para>
These mistakes could lead to incorrect query plans that would give wrong
answers, or to assertion failures in assert-enabled builds, or to odd
planner errors such as <quote>could not devise a query plan for the
given query</>, <quote>could not find pathkey item to
sort</>, <quote>plan should not reference subplan's variable</>,
or <quote>failed to assign all NestLoopParams to plan nodes</>.
Thanks are due to Andreas Seltenreich and Piotr Stefaniak for fuzz
testing that exposed these problems.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL9_5_BR [2cb9ec1bc] 2015-06-22 18:53:27 -0400
Branch: REL9_4_STABLE [d8f9ab776] 2015-06-22 18:53:27 -0400
Branch: REL9_3_STABLE [673068588] 2015-06-22 18:53:27 -0400
Branch: REL9_2_STABLE [e538e510e] 2015-06-22 18:53:27 -0400
-->
<listitem>
<para>
Improve planner's performance for <command>UPDATE</>/<command>DELETE</>
on large inheritance sets (Tom Lane, Dean Rasheed)
</para>
</listitem>
<!--
Author: Fujii Masao <fujii@postgresql.org>
Branch: master [96f6a0cb4] 2015-09-09 22:51:44 +0900
Branch: REL9_5_STABLE [65f37b3e9] 2015-09-09 22:52:28 +0900
Branch: REL9_4_STABLE [2244c0652] 2015-09-09 22:52:35 +0900
Branch: REL9_3_STABLE [47387732b] 2015-09-09 22:52:40 +0900
Branch: REL9_2_STABLE [67518a141] 2015-09-09 23:01:10 +0900
Branch: REL9_1_STABLE [60fe73b79] 2015-09-09 23:03:17 +0900
-->
<listitem>
<para>
Ensure standby promotion trigger files are removed at postmaster
startup (Michael Paquier, Fujii Masao)
</para>
<para>
This prevents unwanted promotion from occurring if these files appear
in a database backup that is used to initialize a new standby server.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d73d14c27] 2015-08-02 14:55:03 -0400
Branch: REL9_5_STABLE [72697d2ba] 2015-08-02 14:55:04 -0400
Branch: REL9_4_STABLE [c6d901292] 2015-08-02 14:55:05 -0400
Branch: REL9_3_STABLE [fad824a88] 2015-08-02 14:54:44 -0400
Branch: REL9_2_STABLE [20d1878b6] 2015-08-02 14:54:44 -0400
Branch: REL9_1_STABLE [f1e84d3eb] 2015-08-02 14:54:44 -0400
Branch: REL9_0_STABLE [8b53c087d] 2015-08-02 14:54:44 -0400
-->
<listitem>
<para>
During postmaster shutdown, ensure that per-socket lock files are
removed and listen sockets are closed before we remove
the <filename>postmaster.pid</> file (Tom Lane)
</para>
<para>
This avoids race-condition failures if an external script attempts to
start a new postmaster as soon as <literal>pg_ctl stop</> returns.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master Release: REL9_5_BR [48913db88] 2015-06-19 14:23:39 -0400
Branch: REL9_4_STABLE [29722d79b] 2015-06-19 14:23:39 -0400
-->
<listitem>
<para>
Ensure that the postmaster does not exit until all its child processes
are gone, even in an immediate shutdown (Tom Lane)
</para>
<para>
Like the previous item, this avoids possible race conditions against a
subsequently-started postmaster.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [45811be94] 2015-07-09 13:22:22 -0400
Branch: REL9_5_STABLE [193e02707] 2015-07-09 13:22:23 -0400
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<listitem>
<para>
Fix postmaster's handling of a startup-process crash during crash
recovery (Tom Lane)
</para>
<para>
If, during a crash recovery cycle, the startup process crashes without
having restored database consistency, we'd try to launch a new startup
process, which typically would just crash again, leading to an infinite
loop.
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master Release: REL9_5_BR [667912aee] 2015-06-21 18:57:28 +0200
Branch: REL9_4_STABLE [ec1408155] 2015-06-21 19:00:30 +0200
Branch: REL9_3_STABLE [203193144] 2015-06-21 19:00:40 +0200
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<listitem>
<para>
Make emergency autovacuuming for multixact wraparound more robust
(Andres Freund)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d8f15c95b] 2015-07-28 17:34:23 -0400
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<listitem>
<para>
Do not print a <literal>WARNING</> when an autovacuum worker is already
gone when we attempt to signal it, and reduce log verbosity for such
signals (Tom Lane)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL9_5_BR [da1a9d0f5] 2015-06-19 12:44:36 -0300
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<listitem>
<para>
Prevent autovacuum launcher from sleeping unduly long if the server
clock is moved backwards a large amount (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Teodor Sigaev <teodor@sigaev.ru>
Branch: master [e26692248] 2015-09-07 17:16:29 +0300
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-->
<listitem>
<para>
Ensure that cleanup of a GIN index's pending-insertions list is
interruptable by cancel requests (Jeff Janes)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [334445179] 2015-07-27 12:30:26 +0300
Branch: REL9_5_STABLE [202aea62a] 2015-07-27 12:31:05 +0300
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-->
<listitem>
<para>
Allow all-zeroes pages in GIN indexes to be reused (Heikki Linnakangas)
</para>
<para>
Such a page might be left behind after a crash.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [023430abf] 2015-07-27 12:28:21 +0300
Branch: REL9_5_STABLE [2fa8ba348] 2015-07-27 12:31:05 +0300
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-->
<listitem>
<para>
Fix handling of all-zeroes pages in SP-GiST indexes (Heikki
Linnakangas)
</para>
<para>
<command>VACUUM</> attempted to recycle such pages, but did so in a
way that wasn't crash-safe.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [766dcfb16] 2015-07-23 01:29:59 +0300
Branch: REL9_5_STABLE [a9b3a22aa] 2015-07-23 01:30:07 +0300
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<listitem>
<para>
Fix off-by-one error that led to otherwise-harmless warnings
about <quote>apparent wraparound</> in subtrans/multixact truncation
(Thomas Munro)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2edb94911] 2015-08-18 19:22:37 -0400
Branch: REL9_5_STABLE [4c3754ffe] 2015-08-18 19:22:37 -0400
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<listitem>
<para>
Fix misreporting of <command>CONTINUE</> and <command>MOVE</> statement
types in <application>PL/pgSQL</>'s error context messages
(Pavel Stehule, Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b631a46ed] 2015-09-29 10:52:22 -0400
Branch: REL9_5_STABLE [a16b9b193] 2015-09-29 10:52:22 -0400
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-->
<listitem>
<para>
Fix <application>PL/Perl</> to handle non-<acronym>ASCII</> error
message texts correctly (Alex Hunsaker)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [09b3d2725] 2015-08-21 11:19:33 -0400
Branch: REL9_5_STABLE [20bef3fe2] 2015-08-21 11:19:40 -0400
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Branch: master [f469f634a] 2015-08-21 12:21:37 -0400
Branch: REL9_5_STABLE [19446280f] 2015-08-21 12:21:37 -0400
Branch: REL9_4_STABLE [22b9ce798] 2015-08-21 12:21:37 -0400
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Branch: REL9_1_STABLE [1d190d095] 2015-08-21 12:21:37 -0400
-->
<listitem>
<para>
Fix <application>PL/Python</> crash when returning the string
representation of a <type>record</> result (Tom Lane)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [f8d67ca8d] 2015-07-20 14:10:07 +0200
Branch: REL9_5_STABLE [b0b6f8d71] 2015-07-20 14:18:08 +0200
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-->
<listitem>
<para>
Fix some places in <application>PL/Tcl</> that neglected to check for
failure of <function>malloc()</> calls (Michael Paquier, Álvaro
Herrera)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [cb3384a0c] 2015-08-02 22:12:33 +0300
Branch: REL9_5_STABLE [ea8385df6] 2015-08-02 22:12:38 +0300
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<listitem>
<para>
In <filename>contrib/isn</>, fix output of ISBN-13 numbers that begin
with 979 (Fabien Coelho)
</para>
<para>
EANs beginning with 979 (but not 9790) are considered ISBNs, but they
must be printed in the new 13-digit format, not the 10-digit format.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8bbe4cbd9] 2015-10-04 17:58:42 -0400
Branch: REL9_5_STABLE [39a716d93] 2015-10-04 17:58:30 -0400
Branch: REL9_4_STABLE [93840f96c] 2015-10-04 17:58:30 -0400
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<listitem>
<para>
Improve <filename>contrib/pg_stat_statements</>' handling of
query-text garbage collection (Peter Geoghegan)
</para>
<para>
The external file containing query texts could bloat to very large
sizes; once it got past 1GB attempts to trim it would fail, soon
leading to situations where the file could not be read at all.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [76f965ff1] 2015-09-24 12:47:29 -0400
Branch: REL9_5_STABLE [59d765b65] 2015-09-24 12:47:30 -0400
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<listitem>
<para>
Improve <filename>contrib/postgres_fdw</>'s handling of
collation-related decisions (Tom Lane)
</para>
<para>
The main user-visible effect is expected to be that comparisons
involving <type>varchar</> columns will be sent to the remote server
for execution in more cases than before.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [414bef30b] 2015-07-07 18:44:59 +0300
Branch: REL9_5_STABLE [28c38396e] 2015-07-07 18:47:25 +0300
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Branch: REL9_0_STABLE [2b189c7ec] 2015-07-07 18:45:31 +0300
-->
<listitem>
<para>
Improve <application>libpq</>'s handling of out-of-memory conditions
(Michael Paquier, Heikki Linnakangas)
</para>
</listitem>
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Author: Michael Meskes <meskes@postgresql.org>
Branch: master Release: REL9_5_BR [82be1bf50] 2015-06-12 14:50:47 +0200
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Branch: master Release: REL9_5_BR [94a484222] 2015-06-15 14:21:03 +0200
Branch: REL9_4_STABLE [2a781b5bb] 2015-06-15 14:22:24 +0200
Branch: REL9_3_STABLE [4130b2c1f] 2015-06-15 14:22:54 +0200
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Branch: REL9_0_STABLE [d278ff3b2] 2015-06-15 14:27:39 +0200
-->
<listitem>
<para>
Fix memory leaks and missing out-of-memory checks
in <application>ecpg</> (Michael Paquier)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [4778a0bda] 2015-09-24 23:01:04 -0400
Branch: REL9_5_STABLE [f1ee153dc] 2015-09-24 23:01:04 -0400
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<listitem>
<para>
Fix <application>psql</>'s code for locale-aware formatting of numeric
output (Tom Lane)
</para>
<para>
The formatting code invoked by <literal>\pset numericlocale on</>
did the wrong thing for some uncommon cases such as numbers with an
exponent but no decimal point. It could also mangle already-localized
output from the <type>money</> data type.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [e135c3d99] 2015-07-08 20:44:21 -0400
Branch: REL9_5_STABLE [fb990ce6c] 2015-07-08 20:44:25 -0400
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-->
<listitem>
<para>
Prevent crash in <application>psql</>'s <command>\c</> command when
there is no current connection (Noah Misch)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8ab4a6bd3] 2015-10-01 16:20:13 -0400
Branch: REL9_5_STABLE [5ea47e8f2] 2015-10-01 16:20:15 -0400
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-->
<listitem>
<para>
Make <application>pg_dump</> handle inherited <literal>NOT VALID</>
check constraints correctly (Tom Lane)
</para>
</listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [caef94d59] 2015-07-25 17:14:36 -0400
Branch: REL9_5_STABLE [08012455c] 2015-07-25 17:15:32 -0400
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Branch: REL9_1_STABLE [af225551e] 2015-07-25 17:16:39 -0400
-->
<listitem>
<para>
Fix selection of default <application>zlib</> compression level
in <application>pg_dump</>'s directory output format (Andrew Dunstan)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [8346218c0] 2015-09-20 20:42:27 -0400
Branch: REL9_5_STABLE [1be9d65e1] 2015-09-20 20:42:44 -0400
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Branch: REL9_0_STABLE [24aed2124] 2015-09-20 20:44:34 -0400
-->
<listitem>
<para>
Ensure that temporary files created during a <application>pg_dump</>
run with <acronym>tar</>-format output are not world-readable (Michael
Paquier)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [7f8d090b8] 2015-09-11 15:51:11 -0400
Branch: REL9_5_STABLE [3243fce88] 2015-09-11 15:51:11 -0400
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Branch: REL9_0_STABLE [52b07779d] 2015-09-11 15:51:10 -0400
-->
<listitem>
<para>
Fix <application>pg_dump</> and <application>pg_upgrade</> to support
cases where the <literal>postgres</> or <literal>template1</> database
is in a non-default tablespace (Marti Raudsepp, Bruce Momjian)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b861678f5] 2015-08-10 20:10:15 -0400
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Branch: REL9_2_STABLE [be9ef396c] 2015-08-10 20:10:16 -0400
Branch: REL9_1_STABLE [34f1a85e5] 2015-08-10 20:10:16 -0400
Branch: REL9_0_STABLE [298d1f808] 2015-08-10 20:10:16 -0400
-->
<listitem>
<para>
Fix <application>pg_dump</> to handle object privileges sanely when
dumping from a server too old to have a particular privilege type
(Tom Lane)
</para>
<para>
When dumping data types from pre-9.2 servers, and when dumping
functions or procedural languages from pre-7.3
servers, <application>pg_dump</> would
produce <command>GRANT</>/<command>REVOKE</> commands that revoked the
owner's grantable privileges and instead granted all privileges
to <literal>PUBLIC</>. Since the privileges involved are
just <literal>USAGE</> and <literal>EXECUTE</>, this isn't a security
problem, but it's certainly a surprising representation of the older
systems' behavior. Fix it to leave the default privilege state alone
in these cases.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3bdd7f90f] 2015-08-04 19:34:12 -0400
Branch: REL9_5_STABLE [1f507c7e9] 2015-08-04 19:34:12 -0400
Branch: REL9_4_STABLE [fa6e785fd] 2015-08-04 19:34:12 -0400
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Branch: REL9_2_STABLE [dae6e4601] 2015-08-04 19:34:12 -0400
Branch: REL9_1_STABLE [270a877cc] 2015-08-04 19:34:12 -0400
Branch: REL9_0_STABLE [5d175be17] 2015-08-04 19:34:12 -0400
-->
<listitem>
<para>
Fix <application>pg_dump</> to dump shell types (Tom Lane)
</para>
<para>
Shell types (that is, not-yet-fully-defined types) aren't useful for
much, but nonetheless <application>pg_dump</> should dump them.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bcc87b6b0] 2015-07-12 16:26:08 -0400
Branch: REL9_5_STABLE [0e78a610f] 2015-07-12 16:26:18 -0400
Branch: REL9_4_STABLE [1ed549387] 2015-07-12 16:25:51 -0400
Branch: REL9_3_STABLE [faf686b54] 2015-07-12 16:25:52 -0400
Branch: REL9_2_STABLE [a24ceea4b] 2015-07-12 16:25:52 -0400
Branch: REL9_1_STABLE [e9a859b54] 2015-07-12 16:25:52 -0400
-->
<listitem>
<para>
Fix assorted minor memory leaks in <application>pg_dump</> and other
client-side programs (Michael Paquier)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [9031ff91a] 2015-07-03 11:12:34 +0300
Branch: REL9_5_STABLE [5174ca17a] 2015-07-03 11:15:55 +0300
Branch: REL9_4_STABLE [9d6352aaa] 2015-07-03 11:15:27 +0300
-->
<listitem>
<para>
Fix <application>pgbench</>'s progress-report behavior when a query,
or <application>pgbench</> itself, gets stuck (Fabien Coelho)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_4_STABLE [747ca6697] 2015-08-29 16:34:30 -0400
-->
<listitem>
<para>
Fix spinlock assembly code for Alpha hardware (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c41a1215f] 2015-08-29 16:09:25 -0400
Branch: REL9_5_STABLE [ffbc387bf] 2015-08-29 16:09:25 -0400
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Branch: REL9_0_STABLE [b5a22d8bb] 2015-08-29 16:09:25 -0400
-->
<listitem>
<para>
Fix spinlock assembly code for PPC hardware to be compatible
with <acronym>AIX</>'s native assembler (Tom Lane)
</para>
<para>
Building with <application>gcc</> didn't work if <application>gcc</>
had been configured to use the native assembler, which is becoming more
common.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [43d89a23d] 2015-07-17 03:01:14 -0400
Branch: REL9_5_STABLE [eb3b93b53] 2015-07-17 03:01:29 -0400
Branch: REL9_4_STABLE [f3f037e18] 2015-07-17 03:01:35 -0400
Branch: REL9_3_STABLE [7319c0524] 2015-07-17 03:02:03 -0400
Branch: REL9_2_STABLE [12073b9aa] 2015-07-17 03:02:18 -0400
Branch: REL9_1_STABLE [76fa354c5] 2015-07-17 03:02:23 -0400
Branch: REL9_0_STABLE [cdf596b1c] 2015-07-17 03:02:46 -0400
-->
<listitem>
<para>
On <acronym>AIX</>, test the <literal>-qlonglong</> compiler option
rather than just assuming it's safe to use (Noah Misch)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [bcd7c4120] 2015-07-15 21:00:26 -0400
Branch: REL9_5_STABLE [c2b824e34] 2015-07-15 21:00:30 -0400
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Branch: REL9_1_STABLE [1dd2b6b68] 2015-07-15 21:00:31 -0400
Branch: REL9_0_STABLE [7803d5720] 2015-07-15 21:00:31 -0400
-->
<listitem>
<para>
On <acronym>AIX</>, use <literal>-Wl,-brtllib</> link option to allow
symbols to be resolved at runtime (Noah Misch)
</para>
<para>
Perl relies on this ability in 5.8.0 and later.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [c53f73879] 2015-07-29 22:49:48 -0400
Branch: REL9_5_STABLE [a664d4790] 2015-07-29 22:52:43 -0400
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Branch: REL9_1_STABLE [d20327a4f] 2015-07-29 22:54:03 -0400
Branch: REL9_0_STABLE [2d8c136e7] 2015-07-29 22:54:08 -0400
-->
<listitem>
<para>
Avoid use of inline functions when compiling with
32-bit <application>xlc</>, due to compiler bugs (Noah Misch)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master Release: REL9_5_BR [ab93f90cd] 2015-06-30 14:20:38 -0300
Branch: REL9_4_STABLE [ef704ec06] 2015-06-30 14:20:38 -0300
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-->
<listitem>
<para>
Use <filename>librt</> for <function>sched_yield()</> when necessary,
which it is on some Solaris versions (Oskari Saarenmaa)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [ec79978dd] 2015-08-14 20:23:13 -0400
Branch: REL9_5_STABLE [f19ad6fbe] 2015-08-14 20:23:35 -0400
Branch: REL9_4_STABLE [a0104e080] 2015-08-14 20:23:42 -0400
-->
<listitem>
<para>
Translate encoding <literal>UHC</> as Windows code page 949
(Noah Misch)
</para>
<para>
This fixes presentation of non-ASCII log messages from processes that
are not attached to any particular database, such as the postmaster.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [43adc7a71] 2015-08-14 20:23:09 -0400
Branch: REL9_5_STABLE [92516bf19] 2015-08-14 20:23:34 -0400
Branch: REL9_4_STABLE [f988da953] 2015-08-14 20:23:41 -0400
-->
<listitem>
<para>
On Windows, avoid failure when doing encoding conversion to UTF16
outside a transaction, such as for log messages (Noah Misch)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master Release: REL9_5_BR [f0a264a36] 2015-06-20 12:09:29 -0400
Branch: REL9_4_STABLE [b2ed1682d] 2015-06-20 12:10:56 -0400
-->
<listitem>
<para>
Fix postmaster startup failure due to not
copying <function>setlocale()</>'s return value (Noah Misch)
</para>
<para>
This has been reported on Windows systems with the ANSI code page set
to CP936 (<quote>Chinese (Simplified, PRC)</>), and may occur with
other multibyte code pages.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [6c534fd68] 2015-07-06 22:18:26 +0300
Branch: REL9_5_STABLE [e5460aa02] 2015-07-07 16:33:10 +0300
Branch: REL9_4_STABLE [4dac5651b] 2015-07-07 16:31:52 +0300
Branch: REL9_3_STABLE [880365a3c] 2015-07-07 16:37:16 +0300
Branch: REL9_2_STABLE [a5273ef37] 2015-07-07 16:37:34 +0300
Branch: REL9_1_STABLE [3b7cf4367] 2015-07-07 16:38:24 +0300
Branch: REL9_0_STABLE [341b877d3] 2015-07-07 16:39:25 +0300
-->
<listitem>
<para>
Fix Windows <filename>install.bat</> script to handle target directory
names that contain spaces (Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a5d489ccb] 2015-07-02 17:24:36 -0400
Branch: REL9_5_STABLE [d1fec374f] 2015-07-05 12:01:01 -0400
Branch: REL9_4_STABLE [60c38e62c] 2015-07-05 12:01:01 -0400
Branch: REL9_3_STABLE [544e75814] 2015-07-05 12:01:01 -0400
Branch: REL9_2_STABLE [89b8cf47b] 2015-07-05 12:01:01 -0400
Branch: REL9_1_STABLE [9b00885d0] 2015-07-05 12:01:01 -0400
Branch: REL9_0_STABLE [29ff43adf] 2015-07-05 12:01:02 -0400
-->
<listitem>
<para>
Make the numeric form of the <productname>PostgreSQL</> version number
(e.g., <literal>90405</>) readily available to extension Makefiles,
as a variable named <varname>VERSION_NUM</> (Michael Paquier)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [241e6844a] 2015-10-02 19:15:39 -0400
Branch: REL9_5_STABLE [19b06cc66] 2015-10-02 19:15:49 -0400
Branch: REL9_4_STABLE [8e45497a2] 2015-10-02 19:15:57 -0400
Branch: REL9_3_STABLE [0f6a046b6] 2015-10-02 19:16:06 -0400
Branch: REL9_2_STABLE [fd519c170] 2015-10-02 19:16:18 -0400
Branch: REL9_1_STABLE [3a68e0a10] 2015-10-02 19:16:29 -0400
Branch: REL9_0_STABLE [47ac95f37] 2015-10-02 19:16:37 -0400
-->
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2015g for
DST law changes in Cayman Islands, Fiji, Moldova, Morocco, Norfolk
Island, North Korea, Turkey, and Uruguay. There is a new zone name
<literal>America/Fort_Nelson</> for the Canadian Northern Rockies.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-4">
<title>Release 9.4.4</title>
<note>
<title>Release Date</title>
<simpara>2015-06-12</simpara>
</note>
<para>
This release contains a small number of fixes from 9.4.3.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.4</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading an installation that was previously
upgraded using a <application>pg_upgrade</> version between 9.3.0 and
9.3.4 inclusive, see the first changelog entry below.
</para>
<para>
Also, if you are upgrading from a version earlier than 9.4.2,
see <xref linkend="release-9-4-2">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [068cfadf9] 2015-06-05 09:31:57 -0400
Branch: REL9_4_STABLE [b6a3444fa] 2015-06-05 09:33:52 -0400
Branch: REL9_3_STABLE [2a9b01928] 2015-06-05 09:34:15 -0400
-->
<listitem>
<para>
Fix possible failure to recover from an inconsistent database state
(Robert Haas)
</para>
<para>
Recent <productname>PostgreSQL</> releases introduced mechanisms to
protect against multixact wraparound, but some of that code did not
account for the possibility that it would need to run during crash
recovery, when the database may not be in a consistent state. This
could result in failure to restart after a crash, or failure to start
up a secondary server. The lingering effects of a previously-fixed
bug in <application>pg_upgrade</> could also cause such a failure, in
installations that had used <application>pg_upgrade</> versions
between 9.3.0 and 9.3.4.
</para>
<para>
The <application>pg_upgrade</> bug in question was that it would
set <literal>oldestMultiXid</> to 1 in <filename>pg_control</> even
if the true value should be higher. With the fixes introduced in
this release, such a situation will result in immediate emergency
autovacuuming until a correct <literal>oldestMultiXid</> value can
be determined. If that would pose a hardship, users can avoid it by
doing manual vacuuming <emphasis>before</> upgrading to this release.
In detail:
<orderedlist>
<listitem>
<para>
Check whether <application>pg_controldata</> reports <quote>Latest
checkpoint's oldestMultiXid</> to be 1. If not, there's nothing
to do.
</para>
</listitem>
<listitem>
<para>
Look in <filename>PGDATA/pg_multixact/offsets</> to see if there's a
file named <filename>0000</>. If there is, there's nothing to do.
</para>
</listitem>
<listitem>
<para>
Otherwise, for each table that has
<structname>pg_class</>.<structfield>relminmxid</> equal to 1,
<command>VACUUM</> that table with
both <xref linkend="guc-vacuum-multixact-freeze-min-age">
and <xref linkend="guc-vacuum-multixact-freeze-table-age"> set to
zero. (You can use the vacuum cost delay parameters described
in <xref linkend="runtime-config-resource-vacuum-cost"> to reduce
the performance consequences for concurrent sessions.)
</para>
</listitem>
</orderedlist>
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f3b5565dd] 2015-06-07 15:32:09 -0400
Branch: REL9_4_STABLE [be25a08a9] 2015-06-07 15:32:09 -0400
Branch: REL9_3_STABLE [4f2458dd7] 2015-06-07 15:32:09 -0400
Branch: REL9_2_STABLE [3e69a73b9] 2015-06-07 15:32:09 -0400
Branch: REL9_1_STABLE [e06e56212] 2015-06-07 15:32:09 -0400
Branch: REL9_0_STABLE [2fe1939b0] 2015-06-07 15:32:09 -0400
-->
<listitem>
<para>
Fix rare failure to invalidate relation cache init file (Tom Lane)
</para>
<para>
With just the wrong timing of concurrent activity, a <command>VACUUM
FULL</> on a system catalog might fail to update the <quote>init file</>
that's used to avoid cache-loading work for new sessions. This would
result in later sessions being unable to access that catalog at all.
This is a very ancient bug, but it's so hard to trigger that no
reproducible case had been seen until recently.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ac23b711d] 2015-06-05 13:22:27 -0400
Branch: REL9_4_STABLE [247263dc3] 2015-06-05 13:22:27 -0400
Branch: REL9_3_STABLE [ac86eda63] 2015-06-05 13:22:27 -0400
Branch: REL9_2_STABLE [04358dab2] 2015-06-05 13:22:27 -0400
Branch: REL9_1_STABLE [002e7d144] 2015-06-05 13:22:27 -0400
Branch: REL9_0_STABLE [dbd99c7f0] 2015-06-05 13:22:27 -0400
-->
<listitem>
<para>
Avoid deadlock between incoming sessions and <literal>CREATE/DROP
DATABASE</> (Tom Lane)
</para>
<para>
A new session starting in a database that is the target of
a <command>DROP DATABASE</> command, or is the template for
a <command>CREATE DATABASE</> command, could cause the command to wait
for five seconds and then fail, even if the new session would have
exited before that.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3f59be836] 2015-06-03 11:59:10 -0400
Branch: REL9_4_STABLE [f0a8515c4] 2015-06-03 11:58:47 -0400
Branch: REL9_3_STABLE [d3fdec6ae] 2015-06-03 11:58:47 -0400
-->
<listitem>
<para>
Improve planner's cost estimates for semi-joins and anti-joins with
inner indexscans (Tom Lane, Tomas Vondra)
</para>
<para>
This type of plan is quite cheap when all the join clauses are used
as index scan conditions, even if the inner scan would nominally
fetch many rows, because the executor will stop after obtaining one
row. The planner only partially accounted for that effect, and would
therefore overestimate the cost, leading it to possibly choose some
other much less efficient plan type.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-3">
<title>Release 9.4.3</title>
<note>
<title>Release Date</title>
<simpara>2015-06-04</simpara>
</note>
<para>
This release contains a small number of fixes from 9.4.2.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.3</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are upgrading from a version earlier than 9.4.2,
see <xref linkend="release-9-4-2">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d8179b001] 2015-05-28 17:33:03 -0400
Branch: REL9_4_STABLE [a3ae3db43] 2015-05-28 17:33:03 -0400
Branch: REL9_3_STABLE [81f3d3b7c] 2015-05-28 17:33:03 -0400
Branch: REL9_2_STABLE [aa8377e64] 2015-05-28 17:33:03 -0400
Branch: REL9_1_STABLE [cb867853a] 2015-05-28 17:33:03 -0400
Branch: REL9_0_STABLE [e4a04e5a4] 2015-05-28 17:33:03 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c07d8c963] 2015-05-29 13:05:16 -0400
Branch: REL9_4_STABLE [dbde225b1] 2015-05-29 13:05:16 -0400
Branch: REL9_3_STABLE [52fc94844] 2015-05-29 13:05:16 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [57e1138bc] 2015-05-29 15:11:36 -0400
Branch: REL9_4_STABLE [70a4519b8] 2015-05-29 15:11:36 -0400
Branch: REL9_3_STABLE [35dd1b51f] 2015-05-29 15:11:36 -0400
Branch: REL9_2_STABLE [77642a819] 2015-05-29 15:11:36 -0400
Branch: REL9_1_STABLE [9e79ca326] 2015-05-29 15:11:36 -0400
Branch: REL9_0_STABLE [bf2f20c08] 2015-05-29 15:11:36 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1943c000b] 2015-05-29 17:02:58 -0400
Branch: REL9_4_STABLE [99f50dd72] 2015-05-29 17:02:58 -0400
Branch: REL9_3_STABLE [c2b68b1f7] 2015-05-29 17:02:58 -0400
-->
<listitem>
<para>
Avoid failures while <function>fsync</>'ing data directory during
crash restart (Abhijit Menon-Sen, Tom Lane)
</para>
<para>
In the previous minor releases we added a patch to <function>fsync</>
everything in the data directory after a crash. Unfortunately its
response to any error condition was to fail, thereby preventing the
server from starting up, even when the problem was quite harmless.
An example is that an unwritable file in the data directory would
prevent restart on some platforms; but it is common to make SSL
certificate files unwritable by the server. Revise this behavior so
that permissions failures are ignored altogether, and other types of
failures are logged but do not prevent continuing.
</para>
<para>
Also apply the same rules in <literal>initdb --sync-only</>.
This case is less critical but it should act similarly.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [f46edf479] 2015-05-28 11:24:37 -0400
Branch: REL9_4_STABLE [d4a9f5519] 2015-05-28 11:24:37 -0400
Branch: REL9_3_STABLE [27bae8d96] 2015-05-28 11:24:37 -0400
Branch: REL9_2_STABLE [f3c67aad4] 2015-05-28 11:24:37 -0400
-->
<listitem>
<para>
Fix <function>pg_get_functiondef()</> to show
functions' <literal>LEAKPROOF</> property, if set (Jeevan Chalke)
</para>
</listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [5302760a5] 2015-05-22 10:21:41 -0400
Branch: REL9_4_STABLE [9b74f32cd] 2015-05-22 10:31:29 -0400
-->
<listitem>
<para>
Fix <function>pushJsonbValue()</> to unpack <type>jbvBinary</>
objects (Andrew Dunstan)
</para>
<para>
This change does not affect any behavior in the core code as of 9.4,
but it avoids a corner case for possible third-party callers.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [86832eb89] 2015-05-26 22:14:59 -0400
Branch: REL9_4_STABLE [79f0f7cab] 2015-05-26 22:14:59 -0400
Branch: REL9_3_STABLE [9e980e7d0] 2015-05-26 22:14:59 -0400
Branch: REL9_2_STABLE [1b1457120] 2015-05-26 22:14:59 -0400
Branch: REL9_1_STABLE [5585cc707] 2015-05-26 22:14:59 -0400
Branch: REL9_0_STABLE [b06649b7f] 2015-05-26 22:15:00 -0400
-->
<listitem>
<para>
Remove <application>configure</>'s check prohibiting linking to a
threaded <application>libpython</>
on <systemitem class="osname">OpenBSD</> (Tom Lane)
</para>
<para>
The failure this restriction was meant to prevent seems to not be a
problem anymore on current <systemitem class="osname">OpenBSD</>
versions.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-2">
<title>Release 9.4.2</title>
<note>
<title>Release Date</title>
<simpara>2015-05-22</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.1.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.2</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you use <filename>contrib/citext</>'s
<function>regexp_matches()</> functions, see the changelog entry below
about that.
</para>
<para>
Also, if you are upgrading from a version earlier than 9.4.1,
see <xref linkend="release-9-4-1">.
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [b0ce38503] 2015-05-18 10:02:31 -0400
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<listitem>
<para>
Avoid possible crash when client disconnects just before the
authentication timeout expires (Benkocs Norbert Attila)
</para>
<para>
If the timeout interrupt fired partway through the session shutdown
sequence, SSL-related state would be freed twice, typically causing a
crash and hence denial of service to other sessions. Experimentation
shows that an unauthenticated remote attacker could trigger the bug
somewhat consistently, hence treat as security issue.
(CVE-2015-3165)
</para>
</listitem>
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Author: Noah Misch <noah@leadboat.com>
Branch: master [cac18a76b] 2015-05-18 10:02:31 -0400
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Author: Noah Misch <noah@leadboat.com>
Branch: master [16304a013] 2015-05-18 10:02:31 -0400
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Author: Noah Misch <noah@leadboat.com>
Branch: master [fd97bd411] 2015-05-18 10:02:31 -0400
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Branch: REL9_0_STABLE [9b5e831e3] 2015-05-18 10:02:38 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0c071936e] 2015-05-19 18:19:38 -0400
Branch: REL9_4_STABLE [2eb2fcd56] 2015-05-19 18:16:19 -0400
Branch: REL9_3_STABLE [13341276e] 2015-05-19 18:16:58 -0400
Branch: REL9_2_STABLE [221f7a949] 2015-05-19 18:17:42 -0400
Branch: REL9_1_STABLE [0510cff6e] 2015-05-19 18:18:16 -0400
Branch: REL9_0_STABLE [cf893530a] 2015-05-19 18:18:56 -0400
-->
<listitem>
<para>
Improve detection of system-call failures (Noah Misch)
</para>
<para>
Our replacement implementation of <function>snprintf()</> failed to
check for errors reported by the underlying system library calls;
the main case that might be missed is out-of-memory situations.
In the worst case this might lead to information exposure, due to our
code assuming that a buffer had been overwritten when it hadn't been.
Also, there were a few places in which security-relevant calls of other
system library functions did not check for failure.
</para>
<para>
It remains possible that some calls of the <function>*printf()</>
family of functions are vulnerable to information disclosure if an
out-of-memory error occurs at just the wrong time. We judge the risk
to not be large, but will continue analysis in this area.
(CVE-2015-3166)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [85270ac7a] 2015-05-18 10:02:31 -0400
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<listitem>
<para>
In <filename>contrib/pgcrypto</>, uniformly report decryption failures
as <quote>Wrong key or corrupt data</> (Noah Misch)
</para>
<para>
Previously, some cases of decryption with an incorrect key could report
other error message texts. It has been shown that such variance in
error reports can aid attackers in recovering keys from other systems.
While it's unknown whether <filename>pgcrypto</>'s specific behaviors
are likewise exploitable, it seems better to avoid the risk by using a
one-size-fits-all message.
(CVE-2015-3167)
</para>
</listitem>
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Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
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Branch: master [669c7d20e] 2015-04-30 13:55:06 -0300
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Author: Robert Haas <rhaas@postgresql.org>
Branch: master [7be47c56a] 2015-05-07 11:19:31 -0400
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Branch: master [312747c22] 2015-05-10 21:34:26 -0400
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Author: Robert Haas <rhaas@postgresql.org>
Branch: master [f6a6c46d7] 2015-05-10 22:21:20 -0400
Branch: REL9_4_STABLE [ded891916] 2015-05-10 22:45:27 -0400
Branch: REL9_3_STABLE [5bbac7ec1] 2015-05-10 22:45:42 -0400
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [53bb309d2] 2015-05-08 12:53:00 -0400
Branch: REL9_4_STABLE [3ecab37d9] 2015-05-08 12:53:30 -0400
Branch: REL9_3_STABLE [596fb5aa7] 2015-05-08 12:55:14 -0400
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [04e6d3b87] 2015-05-11 10:51:14 -0400
Branch: REL9_4_STABLE [8ec1a3a54] 2015-05-11 10:56:19 -0400
Branch: REL9_3_STABLE [543fbecee] 2015-05-11 10:56:32 -0400
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [b4d4ce1d5] 2015-05-11 12:15:50 -0400
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-->
<listitem>
<para>
Protect against wraparound of multixact member IDs
(Álvaro Herrera, Robert Haas, Thomas Munro)
</para>
<para>
Under certain usage patterns, the existing defenses against this might
be insufficient, allowing <filename>pg_multixact/members</> files to be
removed too early, resulting in data loss.
The fix for this includes modifying the server to fail transactions
that would result in overwriting old multixact member ID data, and
improving autovacuum to ensure it will act proactively to prevent
multixact member ID wraparound, as it does for transaction ID
wraparound.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b22527f29] 2015-05-05 15:51:22 -0400
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<listitem>
<para>
Fix incorrect declaration of <filename>contrib/citext</>'s
<function>regexp_matches()</> functions (Tom Lane)
</para>
<para>
These functions should return <type>setof text[]</>, like the core
functions they are wrappers for; but they were incorrectly declared as
returning just <type>text[]</>. This mistake had two results: first,
if there was no match you got a scalar null result, whereas what you
should get is an empty set (zero rows). Second, the <literal>g</> flag
was effectively ignored, since you would get only one result array even
if there were multiple matches.
</para>
<para>
While the latter behavior is clearly a bug, there might be applications
depending on the former behavior; therefore the function declarations
will not be changed by default until <productname>PostgreSQL</> 9.5.
In pre-9.5 branches, the old behavior exists in version 1.0 of
the <literal>citext</> extension, while we have provided corrected
declarations in version 1.1 (which is <emphasis>not</> installed by
default). To adopt the fix in pre-9.5 branches, execute
<literal>ALTER EXTENSION citext UPDATE TO '1.1'</> in each database in
which <literal>citext</> is installed. (You can also <quote>update</>
back to 1.0 if you need to undo that.) Be aware that either update
direction will require dropping and recreating any views or rules that
use <filename>citext</>'s <function>regexp_matches()</> functions.
</para>
</listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [bda76c1c8] 2015-02-26 12:25:21 -0500
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<listitem>
<para>
Render infinite dates and timestamps as <literal>infinity</> when
converting to <type>json</>, rather than throwing an error
(Andrew Dunstan)
</para>
</listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [3c000fd9a] 2015-05-04 12:38:58 -0400
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<listitem>
<para>
Fix <type>json</>/<type>jsonb</>'s <function>populate_record()</>
and <function>to_record()</> functions to handle empty input properly
(Andrew Dunstan)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [20781765f] 2015-05-11 12:25:43 -0400
Branch: REL9_4_STABLE [4d3d9719d] 2015-05-11 12:25:44 -0400
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<listitem>
<para>
Fix incorrect checking of deferred exclusion constraints after a HOT
update (Tom Lane)
</para>
<para>
If a new row that potentially violates a deferred exclusion constraint
is HOT-updated (that is, no indexed columns change and the row can be
stored back onto the same table page) later in the same transaction,
the exclusion constraint would be reported as violated when the check
finally occurred, even if the row(s) the new row originally conflicted
with had been deleted.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a4820434c] 2015-05-03 11:30:24 -0400
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<listitem>
<para>
Fix behavior when changing foreign key constraint deferrability status
with <literal>ALTER TABLE ... ALTER CONSTRAINT</> (Tom Lane)
</para>
<para>
Operations later in the same session or concurrent sessions might not
honor the status change promptly.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b514a7460] 2015-02-28 12:43:04 -0500
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<listitem>
<para>
Fix planning of star-schema-style queries (Tom Lane)
</para>
<para>
Sometimes, efficient scanning of a large table requires that index
parameters be provided from more than one other table (commonly,
dimension tables whose keys are needed to index a large fact table).
The planner should be able to find such plans, but an overly
restrictive search heuristic prevented it.
</para>
</listitem>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3cf868601] 2015-04-25 16:44:27 -0400
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<listitem>
<para>
Prevent improper reordering of antijoins (NOT EXISTS joins) versus
other outer joins (Tom Lane)
</para>
<para>
This oversight in the planner has been observed to cause <quote>could
not find RelOptInfo for given relids</> errors, but it seems possible
that sometimes an incorrect query plan might get past that consistency
check and result in silently-wrong query output.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ca6805338] 2015-04-04 19:55:15 -0400
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<listitem>
<para>
Fix incorrect matching of subexpressions in outer-join plan nodes
(Tom Lane)
</para>
<para>
Previously, if textually identical non-strict subexpressions were used
both above and below an outer join, the planner might try to re-use
the value computed below the join, which would be incorrect because the
executor would force the value to NULL in case of an unmatched outer row.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [1a179f36f] 2015-02-10 20:37:19 -0500
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<listitem>
<para>
Fix GEQO planner to cope with failure of its join order heuristic
(Tom Lane)
</para>
<para>
This oversight has been seen to lead to <quote>failed to join all
relations together</> errors in queries involving <literal>LATERAL</>,
and that might happen in other cases as well.
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [6f9bd50ea] 2015-02-25 21:36:29 -0500
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<listitem>
<para>
Ensure that row locking occurs properly when the target of
an <command>UPDATE</> or <command>DELETE</> is a security-barrier view
(Stephen Frost)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [dfbaed459] 2015-04-28 00:17:43 +0200
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<listitem>
<para>
Use a file opened for read/write when syncing replication slot data
during database startup (Andres Freund)
</para>
<para>
On some platforms, the previous coding could result in errors like
<quote>could not fsync file "pg_replslot/...": Bad file descriptor</>.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [2c47fe16a] 2015-04-23 21:39:35 +0300
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-->
<listitem>
<para>
Fix possible deadlock at startup
when <literal>max_prepared_transactions</> is too small
(Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [b2a5545bd] 2015-04-13 16:53:49 +0300
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-->
<listitem>
<para>
Don't archive useless preallocated WAL files after a timeline switch
(Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [2ce439f33] 2015-05-04 14:13:53 -0400
Branch: REL9_4_STABLE [d8ac77ab1] 2015-05-04 14:19:32 -0400
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Branch: REL9_0_STABLE [30ba0d0c2] 2015-05-04 14:04:53 -0400
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [456ff0863] 2015-05-05 09:29:49 -0400
Branch: REL9_4_STABLE [603fe0181] 2015-05-05 09:16:39 -0400
Branch: REL9_3_STABLE [6fd666954] 2015-05-05 09:19:39 -0400
Branch: REL9_2_STABLE [53e1498c6] 2015-05-05 09:22:51 -0400
Branch: REL9_1_STABLE [6ee1a7738] 2015-05-05 09:25:51 -0400
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-->
<listitem>
<para>
Recursively <function>fsync()</> the data directory after a crash
(Abhijit Menon-Sen, Robert Haas)
</para>
<para>
This ensures consistency if another crash occurs shortly later. (The
second crash would have to be a system-level crash, not just a database
crash, for there to be a problem.)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [5df64f298] 2015-04-08 13:19:49 -0300
Branch: REL9_4_STABLE [ec01c1c0a] 2015-04-08 13:19:49 -0300
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-->
<listitem>
<para>
Fix autovacuum launcher's possible failure to shut down, if an error
occurs after it receives SIGTERM (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [bc49d9324] 2015-04-03 00:07:29 -0400
Branch: REL9_4_STABLE [ee0d06c0b] 2015-04-03 00:07:29 -0400
-->
<listitem>
<para>
Fix failure to handle invalidation messages for system catalogs
early in session startup (Tom Lane)
</para>
<para>
This oversight could result in failures in sessions that start
concurrently with a <command>VACUUM FULL</> on a system catalog.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [701dcc983] 2015-03-30 13:05:27 -0400
Branch: REL9_4_STABLE [2897e069c] 2015-03-30 13:05:35 -0400
-->
<listitem>
<para>
Fix crash in <function>BackendIdGetTransactionIds()</> when trying
to get status for a backend process that just exited (Tom Lane)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [bc208a5a2] 2015-02-23 16:14:14 +0100
Branch: REL9_4_STABLE [89629f289] 2015-02-23 16:14:14 +0100
Branch: REL9_3_STABLE [a6ddff812] 2015-02-23 16:14:15 +0100
Branch: REL9_2_STABLE [c76e6dd7a] 2015-02-23 16:14:15 +0100
Branch: REL9_1_STABLE [25576bee2] 2015-02-23 16:14:15 +0100
Branch: REL9_0_STABLE [87b7fcc87] 2015-02-23 16:14:16 +0100
-->
<listitem>
<para>
Cope with unexpected signals in <function>LockBufferForCleanup()</>
(Andres Freund)
</para>
<para>
This oversight could result in spurious errors about <quote>multiple
backends attempting to wait for pincount 1</>.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [08361cea2] 2015-02-15 23:26:45 -0500
Branch: REL9_4_STABLE [1bf32972e] 2015-02-15 23:26:45 -0500
Branch: REL9_3_STABLE [4662ba5a2] 2015-02-15 23:26:46 -0500
Branch: REL9_2_STABLE [effcaa4c2] 2015-02-15 23:26:46 -0500
-->
<listitem>
<para>
Fix crash when doing <literal>COPY IN</> to a table with check
constraints that contain whole-row references (Tom Lane)
</para>
<para>
The known failure case only crashes in 9.4 and up, but there is very
similar code in 9.3 and 9.2, so back-patch those branches as well.
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [fd6a3f3ad] 2015-02-26 12:50:07 +0100
Branch: REL9_4_STABLE [d72115112] 2015-02-26 12:50:07 +0100
Branch: REL9_3_STABLE [abce8dc7d] 2015-02-26 12:50:07 +0100
Branch: REL9_2_STABLE [d67076529] 2015-02-26 12:50:07 +0100
Branch: REL9_1_STABLE [5c8dabecd] 2015-02-26 12:50:08 +0100
Branch: REL9_0_STABLE [82e0d6eb5] 2015-02-26 12:50:08 +0100
-->
<listitem>
<para>
Avoid waiting for WAL flush or synchronous replication during commit of
a transaction that was read-only so far as the user is concerned
(Andres Freund)
</para>
<para>
Previously, a delay could occur at commit in transactions that had
written WAL due to HOT page pruning, leading to undesirable effects
such as sessions getting stuck at startup if all synchronous replicas
are down. Sessions have also been observed to get stuck in catchup
interrupt processing when using synchronous replication; this will fix
that problem as well.
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [87cec51d3] 2015-03-23 16:51:11 +0100
Branch: REL9_4_STABLE [16be9737c] 2015-03-23 16:52:17 +0100
-->
<listitem>
<para>
Avoid busy-waiting with short <literal>recovery_min_apply_delay</>
values (Andres Freund)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: REL9_4_STABLE [462a2f1f0] 2015-05-13 09:53:50 +0300
Branch: REL9_3_STABLE [96b676cc6] 2015-05-13 09:54:06 +0300
Branch: REL9_2_STABLE [1a99d392c] 2015-05-13 10:06:52 +0300
Branch: REL9_1_STABLE [f6c4a8690] 2015-05-13 10:06:47 +0300
Branch: REL9_0_STABLE [bd1cfde70] 2015-05-13 10:06:38 +0300
-->
<listitem>
<para>
Fix crash when manipulating hash indexes on temporary tables
(Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [ed9cc2b5d] 2015-03-30 16:40:05 -0400
Branch: REL9_4_STABLE [a6a8bf5cd] 2015-03-30 16:40:05 -0400
Branch: REL9_3_STABLE [246bbf65c] 2015-03-30 16:40:05 -0400
Branch: REL9_2_STABLE [f155466fe] 2015-03-30 16:40:05 -0400
Branch: REL9_1_STABLE [46bfe44e8] 2015-03-30 16:40:05 -0400
Branch: REL9_0_STABLE [8f3c57721] 2015-03-30 16:40:05 -0400
-->
<listitem>
<para>
Fix possible failure during hash index bucket split, if other processes
are modifying the index concurrently (Tom Lane)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [26d2c5dc8] 2015-03-12 15:34:32 +0100
Branch: REL9_4_STABLE [d81072026] 2015-03-12 15:40:07 +0100
-->
<listitem>
<para>
Fix memory leaks in GIN index vacuum (Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e4cbfd673] 2015-03-29 15:04:09 -0400
Branch: REL9_4_STABLE [f444de5e3] 2015-03-29 15:04:18 -0400
Branch: REL9_3_STABLE [995a664c8] 2015-03-29 15:04:24 -0400
Branch: REL9_2_STABLE [d12afe114] 2015-03-29 15:04:28 -0400
Branch: REL9_1_STABLE [ab02d35e0] 2015-03-29 15:04:33 -0400
Branch: REL9_0_STABLE [152c94632] 2015-03-29 15:04:38 -0400
-->
<listitem>
<para>
Check for interrupts while analyzing index expressions (Jeff Janes)
</para>
<para>
<command>ANALYZE</> executes index expressions many times; if there are
slow functions in such an expression, it's desirable to be able to
cancel the <command>ANALYZE</> before that loop finishes.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [443fd0540] 2015-03-12 13:39:09 -0400
Branch: REL9_4_STABLE [32269be59] 2015-03-12 13:39:10 -0400
Branch: REL9_3_STABLE [5bdf3cf5a] 2015-03-12 13:38:49 -0400
Branch: REL9_2_STABLE [590fc5d96] 2015-03-12 13:38:49 -0400
Branch: REL9_1_STABLE [4a4fd2b0c] 2015-03-12 13:38:49 -0400
-->
<listitem>
<para>
Ensure <structfield>tableoid</> of a foreign table is reported
correctly when a <literal>READ COMMITTED</> recheck occurs after
locking rows in <command>SELECT FOR UPDATE</>, <command>UPDATE</>,
or <command>DELETE</> (Etsuro Fujita)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [cf34e373f] 2015-03-05 18:03:16 -0300
Branch: REL9_4_STABLE [749977634] 2015-03-05 18:03:16 -0300
Branch: REL9_3_STABLE [5cf400003] 2015-03-05 18:03:16 -0300
Branch: REL9_2_STABLE [e166e6441] 2015-03-05 18:03:16 -0300
Branch: REL9_1_STABLE [8167ef8e2] 2015-03-05 18:03:16 -0300
Branch: REL9_0_STABLE [71b8e8e6c] 2015-03-05 18:03:16 -0300
-->
<listitem>
<para>
Add the name of the target server to object description strings for
foreign-server user mappings (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [0d906798f] 2015-02-18 14:28:11 -0300
Branch: REL9_4_STABLE [66463a3cf] 2015-02-18 14:28:12 -0300
Branch: REL9_3_STABLE [a196e67f9] 2015-02-18 14:28:12 -0300
-->
<listitem>
<para>
Include the schema name in object identity strings for conversions
(Álvaro Herrera)
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: REL9_4_STABLE [c106f397d] 2015-05-08 19:39:52 -0400
Branch: REL9_3_STABLE [3de791ee7] 2015-05-08 19:40:06 -0400
Branch: REL9_2_STABLE [21cb21de2] 2015-05-08 19:40:09 -0400
Branch: REL9_1_STABLE [edfef090a] 2015-05-08 19:40:11 -0400
Branch: REL9_0_STABLE [c981e5999] 2015-05-08 19:40:15 -0400
-->
<listitem>
<para>
Recommend setting <literal>include_realm</> to 1 when using
Kerberos/GSSAPI/SSPI authentication (Stephen Frost)
</para>
<para>
Without this, identically-named users from different realms cannot be
distinguished. For the moment this is only a documentation change, but
it will become the default setting in <productname>PostgreSQL</> 9.5.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [cb66f495f] 2015-02-16 16:18:31 -0500
Branch: REL9_4_STABLE [23291a796] 2015-02-16 16:17:59 -0500
Branch: REL9_3_STABLE [7bc6e5954] 2015-02-16 16:18:04 -0500
Branch: REL9_2_STABLE [3913b897d] 2015-02-16 16:18:08 -0500
Branch: REL9_1_STABLE [2df854f84] 2015-02-16 16:18:12 -0500
Branch: REL9_0_STABLE [c99ef9aff] 2015-02-16 16:18:17 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [2e105def0] 2015-02-17 12:49:18 -0500
Branch: REL9_4_STABLE [a271c9260] 2015-02-17 12:49:18 -0500
Branch: REL9_3_STABLE [4ea2d2ddb] 2015-02-17 12:49:18 -0500
Branch: REL9_2_STABLE [d068609b9] 2015-02-17 12:49:44 -0500
Branch: REL9_1_STABLE [64e045838] 2015-02-17 12:49:46 -0500
Branch: REL9_0_STABLE [e48ce4f33] 2015-02-17 12:49:18 -0500
-->
<listitem>
<para>
Remove code for matching IPv4 <filename>pg_hba.conf</> entries to
IPv4-in-IPv6 addresses (Tom Lane)
</para>
<para>
This hack was added in 2003 in response to a report that some Linux
kernels of the time would report IPv4 connections as having
IPv4-in-IPv6 addresses. However, the logic was accidentally broken in
9.0. The lack of any field complaints since then shows that it's not
needed anymore. Now we have reports that the broken code causes
crashes on some systems, so let's just remove it rather than fix it.
(Had we chosen to fix it, that would make for a subtle and potentially
security-sensitive change in the effective meaning of
IPv4 <filename>pg_hba.conf</> entries, which does not seem like a good
thing to do in minor releases.)
</para>
</listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [bf740ce9e] 2015-03-19 11:04:09 -0400
Branch: REL9_4_STABLE [76d07a2a0] 2015-03-19 11:08:54 -0400
-->
<listitem>
<para>
Fix status reporting for terminated background workers that were never
actually started (Robert Haas)
</para>
</listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [b3a5e76e1] 2015-04-02 14:38:06 -0400
Branch: REL9_4_STABLE [a1f4ade01] 2015-04-02 14:39:18 -0400
-->
<listitem>
<para>
After a database crash, don't restart background workers that are
marked <literal>BGW_NEVER_RESTART</> (Amit Khandekar)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [ff16b40f8] 2015-02-06 11:26:50 +0200
Branch: REL9_4_STABLE [3bc4c6942] 2015-02-06 11:27:12 +0200
Branch: REL9_3_STABLE [5f0ba4abb] 2015-02-06 11:32:16 +0200
Branch: REL9_2_STABLE [2af568c6b] 2015-02-06 11:32:37 +0200
Branch: REL9_1_STABLE [0d36d9f2b] 2015-02-06 11:32:42 +0200
-->
<listitem>
<para>
Report WAL flush, not insert, position in <literal>IDENTIFY_SYSTEM</>
replication command (Heikki Linnakangas)
</para>
<para>
This avoids a possible startup failure
in <application>pg_receivexlog</>.
</para>
</listitem>
<!--
Author: Magnus Hagander <magnus@hagander.net>
Branch: master [1a241d22a] 2015-05-07 15:04:13 +0200
Branch: REL9_4_STABLE [43ed06816] 2015-05-07 15:09:21 +0200
Branch: REL9_3_STABLE [ba3caee84] 2015-05-07 15:09:32 +0200
Branch: REL9_2_STABLE [447e16581] 2015-05-07 15:09:42 +0200
Branch: REL9_1_STABLE [b9ded1529] 2015-05-07 15:09:53 +0200
Branch: REL9_0_STABLE [78ce2dc8e] 2015-05-07 15:10:01 +0200
-->
<listitem>
<para>
While shutting down service on Windows, periodically send status
updates to the Service Control Manager to prevent it from killing the
service too soon; and ensure that <application>pg_ctl</> will wait for
shutdown (Krystian Bigaj)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [2a3f6e368] 2015-02-23 13:34:21 +0200
Branch: REL9_4_STABLE [0214a61e0] 2015-02-23 13:32:39 +0200
Branch: REL9_3_STABLE [cdf813c59] 2015-02-23 13:32:42 +0200
Branch: REL9_2_STABLE [22c9c8a7e] 2015-02-23 13:32:46 +0200
Branch: REL9_1_STABLE [7052abbb6] 2015-02-23 13:32:50 +0200
Branch: REL9_0_STABLE [8878eaaa8] 2015-02-23 13:32:53 +0200
-->
<listitem>
<para>
Reduce risk of network deadlock when using <application>libpq</>'s
non-blocking mode (Heikki Linnakangas)
</para>
<para>
When sending large volumes of data, it's important to drain the input
buffer every so often, in case the server has sent enough response data
to cause it to block on output. (A typical scenario is that the server
is sending a stream of NOTICE messages during <literal>COPY FROM
STDIN</>.) This worked properly in the normal blocking mode, but not
so much in non-blocking mode. We've modified <application>libpq</>
to opportunistically drain input when it can, but a full defense
against this problem requires application cooperation: the application
should watch for socket read-ready as well as write-ready conditions,
and be sure to call <function>PQconsumeInput()</> upon read-ready.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [b26e20814] 2015-02-21 12:59:54 -0500
Branch: REL9_4_STABLE [9c15a778a] 2015-02-21 12:59:35 -0500
Branch: REL9_3_STABLE [f389b6e0a] 2015-02-21 12:59:39 -0500
Branch: REL9_2_STABLE [83c3115dd] 2015-02-21 12:59:43 -0500
-->
<listitem>
<para>
In <application>libpq</>, fix misparsing of empty values in URI
connection strings (Thomas Fanghaenel)
</para>
</listitem>
<!--
Author: Michael Meskes <meskes@postgresql.org>
Branch: master [1f393fc92] 2015-02-10 12:04:10 +0100
Branch: REL9_4_STABLE [66c4ea8cb] 2015-02-11 10:57:02 +0100
Branch: REL9_3_STABLE [1a321fea7] 2015-02-11 11:13:11 +0100
Branch: REL9_2_STABLE [9be9ac425] 2015-02-11 11:14:14 +0100
Branch: REL9_1_STABLE [32e633195] 2015-02-11 11:27:21 +0100
Branch: REL9_0_STABLE [ce2fcc58e] 2015-02-11 11:30:11 +0100
-->
<listitem>
<para>
Fix array handling in <application>ecpg</> (Michael Meskes)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [fcef16172] 2015-04-01 20:00:07 -0300
Branch: REL9_4_STABLE [a44e54cf4] 2015-04-01 20:00:07 -0300
Branch: REL9_3_STABLE [f4540cae1] 2015-04-01 20:00:07 -0300
Branch: REL9_2_STABLE [d4bacdcb9] 2015-04-01 20:00:07 -0300
Branch: REL9_1_STABLE [276591bc4] 2015-04-01 20:00:07 -0300
Branch: REL9_0_STABLE [557fcfae3] 2015-04-01 20:00:07 -0300
-->
<listitem>
<para>
Fix <application>psql</> to sanely handle URIs and conninfo strings as
the first parameter to <command>\connect</>
(David Fetter, Andrew Dunstan, Álvaro Herrera)
</para>
<para>
This syntax has been accepted (but undocumented) for a long time, but
previously some parameters might be taken from the old connection
instead of the given string, which was agreed to be undesirable.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [df9ebf1ee] 2015-03-14 13:43:00 -0400
Branch: REL9_4_STABLE [f50b5c7d0] 2015-03-14 13:43:08 -0400
Branch: REL9_3_STABLE [2cb76fa6f] 2015-03-14 13:43:13 -0400
Branch: REL9_2_STABLE [309ff2ad0] 2015-03-14 13:43:17 -0400
Branch: REL9_1_STABLE [043fe5c5a] 2015-03-14 13:43:21 -0400
Branch: REL9_0_STABLE [396ef6fd8] 2015-03-14 13:43:26 -0400
-->
<listitem>
<para>
Suppress incorrect complaints from <application>psql</> on some
platforms that it failed to write <filename>~/.psql_history</> at exit
(Tom Lane)
</para>
<para>
This misbehavior was caused by a workaround for a bug in very old
(pre-2006) versions of <application>libedit</>. We fixed it by
removing the workaround, which will cause a similar failure to appear
for anyone still using such versions of <application>libedit</>.
Recommendation: upgrade that library, or use <application>libreadline</>.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9feefedf9] 2015-02-10 22:38:15 -0500
Branch: REL9_4_STABLE [a592e5883] 2015-02-10 22:38:17 -0500
Branch: REL9_3_STABLE [a4e871caa] 2015-02-10 22:38:20 -0500
Branch: REL9_2_STABLE [2593c7039] 2015-02-10 22:38:22 -0500
Branch: REL9_1_STABLE [14794f9b8] 2015-02-10 22:38:26 -0500
Branch: REL9_0_STABLE [8e70f3c40] 2015-02-10 22:38:29 -0500
-->
<listitem>
<para>
Fix <application>pg_dump</>'s rule for deciding which casts are
system-provided casts that should not be dumped (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [0e7e355f2] 2015-02-18 11:43:00 -0500
Branch: REL9_4_STABLE [a75dfb73e] 2015-02-18 11:43:00 -0500
Branch: REL9_3_STABLE [a7ad5cf0c] 2015-02-18 11:43:00 -0500
Branch: REL9_2_STABLE [c86f8f361] 2015-02-18 11:43:00 -0500
Branch: REL9_1_STABLE [b0d53b2e3] 2015-02-18 11:43:00 -0500
-->
<listitem>
<para>
In <application>pg_dump</>, fix failure to honor <literal>-Z</>
compression level option together with <literal>-Fd</>
(Michael Paquier)
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [ebd092bc2] 2015-03-02 14:12:21 -0500
Branch: REL9_4_STABLE [c05fa3433] 2015-03-02 14:12:28 -0500
Branch: REL9_3_STABLE [43d81f16a] 2015-03-02 14:12:33 -0500
Branch: REL9_2_STABLE [d13bbfabb] 2015-03-02 14:12:38 -0500
Branch: REL9_1_STABLE [dcb467b8e] 2015-03-02 14:12:43 -0500
-->
<listitem>
<para>
Make <application>pg_dump</> consider foreign key relationships
between extension configuration tables while choosing dump order
(Gilles Darold, Michael Paquier, Stephen Frost)
</para>
<para>
This oversight could result in producing dumps that fail to reload
because foreign key constraints are transiently violated.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e3bfe6d84] 2015-03-06 13:27:46 -0500
Branch: REL9_4_STABLE [629f8613f] 2015-03-06 13:27:46 -0500
Branch: REL9_3_STABLE [d645273cf] 2015-03-06 13:27:46 -0500
-->
<listitem>
<para>
Avoid possible <application>pg_dump</> failure when concurrent sessions
are creating and dropping temporary functions (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e9f1c01b7] 2015-02-25 12:01:12 -0500
Branch: REL9_4_STABLE [2164a0de2] 2015-02-25 12:01:12 -0500
Branch: REL9_3_STABLE [f864fe074] 2015-02-25 12:01:12 -0500
Branch: REL9_2_STABLE [be8801e9c] 2015-02-25 12:01:12 -0500
Branch: REL9_1_STABLE [f7b41902a] 2015-02-25 12:01:12 -0500
Branch: REL9_0_STABLE [7a501bcbf] 2015-02-25 12:01:12 -0500
-->
<listitem>
<para>
Fix dumping of views that are just <literal>VALUES(...)</> but have
column aliases (Tom Lane)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [b2f95c34f] 2015-05-01 13:03:23 -0400
Branch: REL9_4_STABLE [70fac4844] 2015-05-01 13:03:23 -0400
-->
<listitem>
<para>
Ensure that a view's replication identity is correctly set
to <literal>nothing</> during dump/restore (Marko Tiikkaja)
</para>
<para>
Previously, if the view was involved in a circular dependency,
it might wind up with an incorrect replication identity property.
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [4c5e06004] 2015-05-16 00:40:18 -0400
Branch: REL9_4_STABLE [387a3e46c] 2015-05-16 00:40:18 -0400
Branch: REL9_3_STABLE [bffbeec0c] 2015-05-16 00:40:18 -0400
Branch: REL9_2_STABLE [affc04d16] 2015-05-16 00:40:18 -0400
Branch: REL9_1_STABLE [acd75b264] 2015-05-16 00:40:18 -0400
Branch: REL9_0_STABLE [df161c94e] 2015-05-16 00:40:18 -0400
Author: Bruce Momjian <bruce@momjian.us>
Branch: REL9_4_STABLE [5f6539635] 2015-05-16 15:16:28 -0400
Branch: REL9_3_STABLE [4e9935979] 2015-05-16 15:16:28 -0400
-->
<listitem>
<para>
In <application>pg_upgrade</>, force timeline 1 in the new cluster
(Bruce Momjian)
</para>
<para>
This change prevents upgrade failures caused by bogus complaints about
missing WAL history files.
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [fb694d959] 2015-05-16 00:10:03 -0400
Branch: REL9_4_STABLE [31f5d3f35] 2015-05-16 00:10:03 -0400
Branch: REL9_3_STABLE [4cfba5369] 2015-05-16 00:10:03 -0400
Branch: REL9_2_STABLE [2a55e7134] 2015-05-16 00:10:03 -0400
Branch: REL9_1_STABLE [321db7123] 2015-05-16 00:10:03 -0400
Branch: REL9_0_STABLE [2194aa92b] 2015-05-16 00:10:03 -0400
-->
<listitem>
<para>
In <application>pg_upgrade</>, check for improperly non-connectable
databases before proceeding
(Bruce Momjian)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [056764b10] 2015-02-11 22:06:04 -0500
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<listitem>
<para>
In <application>pg_upgrade</>, quote directory paths
properly in the generated <literal>delete_old_cluster</> script
(Bruce Momjian)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [866f3017a] 2015-02-11 21:02:44 -0500
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-->
<listitem>
<para>
In <application>pg_upgrade</>, preserve database-level freezing info
properly
(Bruce Momjian)
</para>
<para>
This oversight could cause missing-clog-file errors for tables within
the <literal>postgres</> and <literal>template1</> databases.
</para>
</listitem>
<!--
Author: Andrew Dunstan <andrew@dunslane.net>
Branch: master [fa1e5afa8] 2015-03-30 17:07:52 -0400
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<listitem>
<para>
Run <application>pg_upgrade</> and <application>pg_resetxlog</> with
restricted privileges on Windows, so that they don't fail when run by
an administrator (Muhammad Asif Naeem)
</para>
</listitem>
<!--
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [5d6c2405f] 2015-02-17 10:19:30 -0500
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-->
<listitem>
<para>
Improve handling of <function>readdir()</> failures when scanning
directories in <application>initdb</> and <application>pg_basebackup</>
(Marco Nenciarini)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8d1f23900] 2015-03-15 23:22:03 -0400
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-->
<listitem>
<para>
Fix slow sorting algorithm in <filename>contrib/intarray</> (Tom Lane)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [33e879c4e] 2015-02-13 23:56:25 +0200
Branch: REL9_4_STABLE [56a23a83f] 2015-02-13 23:56:57 +0200
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-->
<listitem>
<para>
Fix compile failure on Sparc V8 machines (Rob Rowan)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [91f4a5a97] 2015-03-14 14:08:45 -0400
Branch: REL9_4_STABLE [c415c13b7] 2015-03-14 14:08:45 -0400
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [73b416b2e] 2015-04-05 13:01:59 -0400
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<listitem>
<para>
Silence some build warnings on macOS (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9d366c1f3] 2015-05-15 19:35:29 -0400
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-->
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2015d
for DST law changes in Egypt, Mongolia, and Palestine, plus historical
changes in Canada and Chile. Also adopt revised zone abbreviations for
the America/Adak zone (HST/HDT not HAST/HADT).
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4-1">
<title>Release 9.4.1</title>
<note>
<title>Release Date</title>
<simpara>2015-02-05</simpara>
</note>
<para>
This release contains a variety of fixes from 9.4.0.
For information about new features in the 9.4 major release, see
<xref linkend="release-9-4">.
</para>
<sect2>
<title>Migration to Version 9.4.1</title>
<para>
A dump/restore is not required for those running 9.4.X.
</para>
<para>
However, if you are a Windows user and are using the <quote>Norwegian
(Bokmål)</> locale, manual action is needed after the upgrade to
replace any <quote>Norwegian (Bokmål)_Norway</>
or <quote>norwegian-bokmal</> locale names stored
in <productname>PostgreSQL</> system catalogs with the plain-ASCII
alias <quote>Norwegian_Norway</>. For details see
<ulink url="http://wiki.postgresql.org/wiki/Changes_To_Norwegian_Locale"></>
</para>
</sect2>
<sect2>
<title>Changes</title>
<itemizedlist>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [0150ab567] 2015-02-02 10:00:44 -0500
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Author: Bruce Momjian <bruce@momjian.us>
Branch: master [9241c84cb] 2015-02-02 10:00:45 -0500
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-->
<listitem>
<para>
Fix buffer overruns in <function>to_char()</>
(Bruce Momjian)
</para>
<para>
When <function>to_char()</> processes a numeric formatting template
calling for a large number of digits, <productname>PostgreSQL</>
would read past the end of a buffer. When processing a crafted
timestamp formatting template, <productname>PostgreSQL</> would write
past the end of a buffer. Either case could crash the server.
We have not ruled out the possibility of attacks that lead to
privilege escalation, though they seem unlikely.
(CVE-2015-0241)
</para>
</listitem>
<!--
Author: Bruce Momjian <bruce@momjian.us>
Branch: master [29725b3db] 2015-02-02 10:00:45 -0500
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<listitem>
<para>
Fix buffer overrun in replacement <function>*printf()</> functions
(Tom Lane)
</para>
<para>
<productname>PostgreSQL</> includes a replacement implementation
of <function>printf</> and related functions. This code will overrun
a stack buffer when formatting a floating point number (conversion
specifiers <literal>e</>, <literal>E</>, <literal>f</>, <literal>F</>,
<literal>g</> or <literal>G</>) with requested precision greater than
about 500. This will crash the server, and we have not ruled out the
possibility of attacks that lead to privilege escalation.
A database user can trigger such a buffer overrun through
the <function>to_char()</> SQL function. While that is the only
affected core <productname>PostgreSQL</> functionality, extension
modules that use printf-family functions may be at risk as well.
</para>
<para>
This issue primarily affects <productname>PostgreSQL</> on Windows.
<productname>PostgreSQL</> uses the system implementation of these
functions where adequate, which it is on other modern platforms.
(CVE-2015-0242)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [1dc755158] 2015-02-02 10:00:45 -0500
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Author: Noah Misch <noah@leadboat.com>
Branch: master [8b59672d8] 2015-02-02 10:00:45 -0500
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-->
<listitem>
<para>
Fix buffer overruns in <filename>contrib/pgcrypto</>
(Marko Tiikkaja, Noah Misch)
</para>
<para>
Errors in memory size tracking within the <filename>pgcrypto</>
module permitted stack buffer overruns and improper dependence on the
contents of uninitialized memory. The buffer overrun cases can
crash the server, and we have not ruled out the possibility of
attacks that lead to privilege escalation.
(CVE-2015-0243)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [2b3a8b20c] 2015-02-02 17:09:53 +0200
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<listitem>
<para>
Fix possible loss of frontend/backend protocol synchronization after
an error
(Heikki Linnakangas)
</para>
<para>
If any error occurred while the server was in the middle of reading a
protocol message from the client, it could lose synchronization and
incorrectly try to interpret part of the message's data as a new
protocol message. An attacker able to submit crafted binary data
within a command parameter might succeed in injecting his own SQL
commands this way. Statement timeout and query cancellation are the
most likely sources of errors triggering this scenario. Particularly
vulnerable are applications that use a timeout and also submit
arbitrary user-crafted data as binary query parameters. Disabling
statement timeout will reduce, but not eliminate, the risk of
exploit. Our thanks to Emil Lenngren for reporting this issue.
(CVE-2015-0244)
</para>
</listitem>
<!--
Author: Stephen Frost <sfrost@snowman.net>
Branch: master [804b6b6db] 2015-01-28 12:31:30 -0500
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<listitem>
<para>
Fix information leak via constraint-violation error messages
(Stephen Frost)
</para>
<para>
Some server error messages show the values of columns that violate
a constraint, such as a unique constraint. If the user does not have
<literal>SELECT</> privilege on all columns of the table, this could
mean exposing values that the user should not be able to see. Adjust
the code so that values are displayed only when they came from the SQL
command or could be selected by the user.
(CVE-2014-8161)
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [f6dc6dd5b] 2014-12-17 22:48:40 -0500
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<listitem>
<para>
Lock down regression testing's temporary installations on Windows
(Noah Misch)
</para>
<para>
Use SSPI authentication to allow connections only from the OS user
who launched the test suite. This closes on Windows the same
vulnerability previously closed on other platforms, namely that other
users might be able to connect to the test postmaster.
(CVE-2014-0067)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: REL9_3_STABLE [8f80dcf3c] 2014-10-24 19:59:49 +0300
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Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: REL9_3_STABLE [2a1b34959] 2014-10-24 19:36:28 +0300
Branch: REL9_2_STABLE [737ae3fc7] 2014-10-24 19:53:27 +0300
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [aa1d2fc5e] 2015-01-16 13:28:19 +0200
Branch: REL9_4_STABLE [2049a7d82] 2015-01-16 13:10:06 +0200
Branch: REL9_3_STABLE [1619442a1] 2015-01-16 13:10:15 +0200
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-->
<listitem>
<para>
Cope with the Windows locale named <quote>Norwegian (Bokmål)</>
(Heikki Linnakangas)
</para>
<para>
Non-ASCII locale names are problematic since it's not clear what
encoding they should be represented in. Map the troublesome locale
name to a plain-ASCII alias, <quote>Norwegian_Norway</>.
</para>
<para>
9.4.0 mapped the troublesome name to <quote>norwegian-bokmal</>,
but that turns out not to work on all Windows configurations.
<quote>Norwegian_Norway</> is now recommended instead.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [c480cb9d2] 2015-01-15 18:52:58 -0500
Branch: REL9_4_STABLE [b75d18bd4] 2015-01-15 18:53:05 -0500
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<listitem>
<para>
Fix use-of-already-freed-memory problem in EvalPlanQual processing
(Tom Lane)
</para>
<para>
In <literal>READ COMMITTED</> mode, queries that lock or update
recently-updated rows could crash as a result of this bug.
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [0e5680f47] 2014-12-26 13:52:27 -0300
Branch: REL9_4_STABLE [0e3a1f71d] 2014-12-26 13:52:27 -0300
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-->
<listitem>
<para>
Avoid possible deadlock while trying to acquire tuple locks
in EvalPlanQual processing (Álvaro Herrera, Mark Kirkwood)
</para>
</listitem>
<!--
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [d5e3d1e96] 2015-01-04 15:48:29 -0300
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<listitem>
<para>
Fix failure to wait when a transaction tries to acquire a <literal>FOR
NO KEY EXCLUSIVE</> tuple lock, while multiple other transactions
currently hold <literal>FOR SHARE</> locks (Álvaro Herrera)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a5cd70dcb] 2015-01-15 13:18:12 -0500
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-->
<listitem>
<para>
Improve performance of <command>EXPLAIN</> with large range tables
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [451d28081] 2015-01-30 14:44:56 -0500
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<listitem>
<para>
Fix <type>jsonb</> Unicode escape processing, and in consequence
disallow <literal>\u0000</> (Tom Lane)
</para>
<para>
Previously, the JSON Unicode escape <literal>\u0000</> was accepted
and was stored as those six characters; but that is indistinguishable
from what is stored for the input <literal>\\u0000</>, resulting in
ambiguity. Moreover, in cases where de-escaped textual output is
expected, such as the <literal>->></> operator, the sequence was
printed as <literal>\u0000</>, which does not meet the expectation
that JSON escaping would be removed. (Consistent behavior would
require emitting a zero byte, but <productname>PostgreSQL</> does not
support zero bytes embedded in text strings.) 9.4.0 included an
ill-advised attempt to improve this situation by adjusting JSON output
conversion rules; but of course that could not fix the fundamental
ambiguity, and it turned out to break other usages of Unicode escape
sequences. Revert that, and to avoid the core problem,
reject <literal>\u0000</> in <type>jsonb</> input.
</para>
<para>
If a <type>jsonb</> column contains a <literal>\u0000</> value stored
with 9.4.0, it will henceforth read out as though it
were <literal>\\u0000</>, which is the other valid interpretation of
the data stored by 9.4.0 for this case.
</para>
<para>
The <type>json</> type did not have the storage-ambiguity problem, but
it did have the problem of inconsistent de-escaped textual output.
Therefore <literal>\u0000</> will now also be rejected
in <type>json</> values when conversion to de-escaped form is
required. This change does not break the ability to
store <literal>\u0000</> in <type>json</> columns so long as no
processing is done on the values. This is exactly parallel to the
cases in which non-ASCII Unicode escapes are allowed when the database
encoding is not UTF8.
</para>
</listitem>
<!--
Author: Peter Eisentraut <peter_e@gmx.net>
Branch: master [79af9a1d2] 2015-01-06 23:06:13 -0500
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<listitem>
<para>
Fix namespace handling in <function>xpath()</> (Ali Akbar)
</para>
<para>
Previously, the <type>xml</> value resulting from
an <function>xpath()</> call would not have namespace declarations if
the namespace declarations were attached to an ancestor element in the
input <type>xml</> value, rather than to the specific element being
returned. Propagate the ancestral declaration so that the result is
correct when considered in isolation.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [3d660d33a] 2015-01-30 12:30:59 -0500
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<listitem>
<para>
Fix assorted oversights in range-operator selectivity estimation
(Emre Hasegeli)
</para>
<para>
This patch fixes corner-case <quote>unexpected operator NNNN</> planner
errors, and improves the selectivity estimates for some other cases.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [930fd6845] 2014-12-30 14:53:11 +0200
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<listitem>
<para>
Revert unintended reduction in maximum size of a GIN index item
(Heikki Linnakangas)
</para>
<para>
9.4.0 could fail with <quote>index row size exceeds maximum</> errors
for data that previous versions would accept.
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [68fa75f31] 2015-01-30 17:58:23 +0100
Branch: REL9_4_STABLE [dc40ca696] 2015-01-30 17:59:17 +0100
-->
<listitem>
<para>
Fix query-duration memory leak during repeated GIN index rescans
(Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [31ed42b9a] 2015-01-29 19:35:55 +0200
Branch: REL9_4_STABLE [28a37deab] 2015-01-29 19:37:29 +0200
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Branch: REL9_1_STABLE [37e0f13f2] 2015-01-29 19:37:22 +0200
-->
<listitem>
<para>
Fix possible crash when using
nonzero <varname>gin_fuzzy_search_limit</> (Heikki Linnakangas)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [3fabed070] 2015-01-07 00:19:37 +0100
Branch: REL9_4_STABLE [7da102154] 2015-01-07 00:24:58 +0100
Author: Andres Freund <andres@anarazel.de>
Branch: master [31912d01d] 2015-01-07 00:18:00 +0100
Branch: REL9_4_STABLE [84911ff51] 2015-01-07 00:24:47 +0100
-->
<listitem>
<para>
Assorted fixes for logical decoding (Andres Freund)
</para>
</listitem>
<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [49b04188f] 2015-01-15 20:52:41 +0200
Branch: REL9_4_STABLE [b337d9657] 2015-01-15 20:52:18 +0200
-->
<listitem>
<para>
Fix incorrect replay of WAL parameter change records that report
changes in the <varname>wal_log_hints</> setting (Petr Jelinek)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [75b48e1ff] 2015-01-19 23:01:33 -0500
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<listitem>
<para>
Change <quote>pgstat wait timeout</> warning message to be LOG level,
and rephrase it to be more understandable (Tom Lane)
</para>
<para>
This message was originally thought to be essentially a can't-happen
case, but it occurs often enough on our slower buildfarm members to be
a nuisance. Reduce it to LOG level, and expend a bit more effort on
the wording: it now reads <quote>using stale statistics instead of
current ones because stats collector is not responding</>.
</para>
</listitem>
<!--
Author: Noah Misch <noah@leadboat.com>
Branch: master [894459e59] 2015-01-07 22:35:44 -0500
Branch: REL9_4_STABLE [83fb1ca5c] 2015-01-07 22:36:35 -0500
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-->
<listitem>
<para>
Warn if macOS's <function>setlocale()</> starts an unwanted extra
thread inside the postmaster (Noah Misch)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [080eabe2e] 2015-01-11 12:35:44 -0500
Branch: REL9_4_STABLE [733728ff3] 2015-01-11 12:35:47 -0500
-->
<listitem>
<para>
Fix <application>libpq</>'s behavior when <filename>/etc/passwd</>
isn't readable (Tom Lane)
</para>
<para>
While doing <function>PQsetdbLogin()</>, <application>libpq</>
attempts to ascertain the user's operating system name, which on most
Unix platforms involves reading <filename>/etc/passwd</>. As of 9.4,
failure to do that was treated as a hard error. Restore the previous
behavior, which was to fail only if the application does not provide a
database role name to connect as. This supports operation in chroot
environments that lack an <filename>/etc/passwd</> file.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [28551797a] 2014-12-31 12:18:50 -0500
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-->
<listitem>
<para>
Improve consistency of parsing of <application>psql</>'s special
variables (Tom Lane)
</para>
<para>
Allow variant spellings of <literal>on</> and <literal>off</> (such
as <literal>1</>/<literal>0</>) for <literal>ECHO_HIDDEN</>
and <literal>ON_ERROR_ROLLBACK</>. Report a warning for unrecognized
values for <literal>COMP_KEYWORD_CASE</>, <literal>ECHO</>,
<literal>ECHO_HIDDEN</>, <literal>HISTCONTROL</>,
<literal>ON_ERROR_ROLLBACK</>, and <literal>VERBOSITY</>. Recognize
all values for all these variables case-insensitively; previously
there was a mishmash of case-sensitive and case-insensitive behaviors.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [adfc157dd] 2015-01-05 19:27:04 -0500
Branch: REL9_4_STABLE [c99e41f68] 2015-01-05 19:27:06 -0500
Branch: REL9_3_STABLE [bb1e2426b] 2015-01-05 19:27:09 -0500
-->
<listitem>
<para>
Fix <application>pg_dump</> to handle comments on event triggers
without failing (Tom Lane)
</para>
</listitem>
<!--
Author: Kevin Grittner <kgrittn@postgresql.org>
Branch: master [cff1bd2a3] 2015-01-30 08:57:24 -0600
Branch: REL9_4_STABLE [cb0168528] 2015-01-30 08:57:53 -0600
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-->
<listitem>
<para>
Allow parallel <application>pg_dump</> to
use <option>--serializable-deferrable</> (Kevin Grittner)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: master [2c0a48589] 2015-01-03 20:54:12 +0100
Branch: REL9_4_STABLE [90e4a2bf9] 2015-01-03 20:54:13 +0100
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<listitem>
<para>
Prevent WAL files created by <literal>pg_basebackup -x/-X</> from
being archived again when the standby is promoted (Andres Freund)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [37507962c] 2015-01-29 20:18:33 -0500
Branch: REL9_4_STABLE [202621d04] 2015-01-29 20:18:37 -0500
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-->
<listitem>
<para>
Handle unexpected query results, especially NULLs, safely in
<filename>contrib/tablefunc</>'s <function>connectby()</>
(Michael Paquier)
</para>
<para>
<function>connectby()</> previously crashed if it encountered a NULL
key value. It now prints that row but doesn't recurse further.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [a59ee8819] 2015-01-30 13:05:30 -0500
Branch: REL9_4_STABLE [70da7aeba] 2015-01-30 13:04:59 -0500
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: REL9_3_STABLE [8824bae87] 2014-11-18 13:28:13 -0500
Author: Robert Haas <rhaas@postgresql.org>
Branch: master [0b49642b9] 2015-01-15 09:26:03 -0500
Branch: REL9_4_STABLE [7b65f194e] 2015-01-15 09:29:41 -0500
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Branch: REL9_0_STABLE [0a67c0018] 2015-01-15 09:42:47 -0500
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Branch: master [e37d474f9] 2015-01-13 14:33:05 +0200
Branch: REL9_4_STABLE [4ebb3494e] 2015-01-13 16:01:04 +0200
Author: Andres Freund <andres@anarazel.de>
Branch: master [8cadeb792] 2015-01-04 15:44:49 +0100
Branch: REL9_4_STABLE [7ced1b6c5] 2015-01-04 15:52:52 +0100
Branch: REL9_3_STABLE [a68b8aec7] 2015-01-04 15:53:08 +0100
Branch: REL9_2_STABLE [6f9b84a40] 2015-01-04 15:55:00 +0100
Author: Andres Freund <andres@anarazel.de>
Branch: master [58bc4747b] 2015-01-04 15:35:46 +0100
Branch: REL9_4_STABLE [2d8411a0a] 2015-01-04 15:35:46 +0100
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Branch: REL9_1_STABLE [39cdf365a] 2015-01-04 15:35:47 +0100
Branch: REL9_0_STABLE [17797e18d] 2015-01-04 15:35:48 +0100
Author: Andres Freund <andres@anarazel.de>
Branch: master [0398ece4c] 2015-01-04 14:36:21 +0100
Branch: REL9_4_STABLE [ff7d46b85] 2015-01-04 14:36:21 +0100
Branch: REL9_3_STABLE [ec14f1601] 2015-01-04 14:36:22 +0100
Branch: REL9_2_STABLE [f4060db11] 2015-01-04 14:36:22 +0100
Author: Tatsuo Ishii <ishii@postgresql.org>
Branch: master [3b5a89c48] 2014-12-30 20:33:01 +0900
Branch: REL9_4_STABLE [458e8bc65] 2014-12-30 20:27:26 +0900
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Branch: REL9_0_STABLE [9b74f3574] 2014-12-30 19:37:55 +0900
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [66709133c] 2014-12-16 15:35:33 -0500
Branch: REL9_4_STABLE [383d224a0] 2014-12-16 15:35:36 -0500
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Branch: REL9_0_STABLE [a2969bd72] 2014-12-16 15:35:49 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [d38e8d30c] 2014-12-16 13:31:42 -0500
Branch: REL9_4_STABLE [6c75384ee] 2014-12-16 13:31:57 -0500
Branch: REL9_3_STABLE [3b750ec15] 2014-12-16 13:32:02 -0500
Branch: REL9_2_STABLE [5b2c8f04a] 2014-12-16 13:32:15 -0500
Branch: REL9_1_STABLE [926da211a] 2014-12-16 13:32:25 -0500
Branch: REL9_0_STABLE [961df1853] 2014-12-16 13:32:38 -0500
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [586dd5d6a] 2015-01-24 13:05:42 -0500
Branch: REL9_4_STABLE [d51d4ff31] 2015-01-24 13:05:45 -0500
Branch: REL9_3_STABLE [7240f9200] 2015-01-24 13:05:49 -0500
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Branch: REL9_0_STABLE [3a3ee655c] 2015-01-24 13:05:58 -0500
-->
<listitem>
<para>
Numerous cleanups of warnings from Coverity static code analyzer
(Andres Freund, Tatsuo Ishii, Marko Kreen, Tom Lane, Michael Paquier)
</para>
<para>
These changes are mostly cosmetic but in some cases fix corner-case
bugs, for example a crash rather than a proper error report after an
out-of-memory failure. None are believed to represent security
issues.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [85a2a8903] 2015-01-14 11:08:13 -0500
Branch: REL9_4_STABLE [adb355106] 2015-01-14 11:08:17 -0500
-->
<listitem>
<para>
Allow <varname>CFLAGS</> from <application>configure</>'s environment
to override automatically-supplied <varname>CFLAGS</> (Tom Lane)
</para>
<para>
Previously, <application>configure</> would add any switches that it
chose of its own accord to the end of the
user-specified <varname>CFLAGS</> string. Since most compilers
process switches left-to-right, this meant that configure's choices
would override the user-specified flags in case of conflicts. That
should work the other way around, so adjust the logic to put the
user's string at the end not the beginning.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [aa719391d] 2015-01-19 23:44:19 -0500
Branch: REL9_4_STABLE [3de9f22ac] 2015-01-19 23:44:22 -0500
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Branch: REL9_0_STABLE [338ff75fc] 2015-01-19 23:44:33 -0500
-->
<listitem>
<para>
Make <application>pg_regress</> remove any temporary installation it
created upon successful exit (Tom Lane)
</para>
<para>
This results in a very substantial reduction in disk space usage
during <literal>make check-world</>, since that sequence involves
creation of numerous temporary installations.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [5b89473d8] 2014-12-24 16:35:23 -0500
Branch: REL9_4_STABLE [068024719] 2014-12-24 16:35:34 -0500
-->
<listitem>
<para>
Add CST (China Standard Time) to our lists of timezone abbreviations
(Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [08bd0c581] 2015-01-30 22:45:44 -0500
Branch: REL9_4_STABLE [c2b06ab17] 2015-01-30 22:45:58 -0500
-->
<listitem>
<para>
Update time zone data files to <application>tzdata</> release 2015a
for DST law changes in Chile and Mexico, plus historical changes in
Iceland.
</para>
</listitem>
</itemizedlist>
</sect2>
</sect1>
<sect1 id="release-9-4">
<title>Release 9.4</title>
<note>
<title>Release Date</title>
<simpara>2014-12-18</simpara>
</note>
<sect2>
<title>Overview</title>
<para>
Major enhancements in <productname>PostgreSQL</> 9.4 include:
</para>
<!-- This list duplicates items below, but without authors or details-->
<itemizedlist>
<listitem>
<para>
Add <link linkend="datatype-json"><type>jsonb</></link>, a more
capable and efficient data type for storing <acronym>JSON</> data
</para>
</listitem>
<listitem>
<para>
Add new <acronym>SQL</> command <xref linkend="SQL-ALTERSYSTEM">
for changing <filename>postgresql.conf</> configuration file entries
</para>
</listitem>
<listitem>
<para>
Reduce lock strength for some <xref linkend="SQL-ALTERTABLE">
commands
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="rules-materializedviews">materialized views</>
to be refreshed without blocking concurrent reads
</para>
</listitem>
<listitem>
<para>
Add support for <link linkend="logicaldecoding">logical decoding</>
of WAL data, to allow database changes to be streamed out in a
customizable format
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="bgworker">background worker processes</>
to be dynamically registered, started and terminated
</para>
</listitem>
</itemizedlist>
<para>
The above items are explained in more detail in the sections below.
</para>
</sect2>
<sect2>
<title>Migration to Version 9.4</title>
<para>
A dump/restore using <xref linkend="app-pg-dumpall">, or use
of <xref linkend="pgupgrade">, is required for those wishing to migrate
data from any previous release.
</para>
<para>
Version 9.4 contains a number of changes that may affect compatibility
with previous releases. Observe the following incompatibilities:
</para>
<itemizedlist>
<listitem>
<para>
Tighten checks for multidimensional <link
linkend="arrays">array</link> input (Bruce Momjian)
</para>
<para>
Previously, an input array string that started with a single-element
sub-array could later contain multi-element sub-arrays,
e.g. <literal>'{{1}, {2,3}}'::int[]</> would be accepted.
</para>
</listitem>
<listitem>
<para>
When converting values of type <type>date</>, <type>timestamp</>
or <type>timestamptz</>
to <link linkend="datatype-json"><type>JSON</type></link>, render the
values in a format compliant with ISO 8601 (Andrew Dunstan)
</para>
<para>
Previously such values were rendered according to the current
<xref linkend="guc-datestyle"> setting; but many JSON processors
require timestamps to be in ISO 8601 format. If necessary, the
previous behavior can be obtained by explicitly casting the datetime
value to <type>text</> before passing it to the JSON conversion
function.
</para>
</listitem>
<listitem>
<para>
The <link linkend="functions-json-op-table"><type>json</type>
<literal>#></> <type>text[]</></link> path extraction operator now
returns its lefthand input, not NULL, if the array is empty (Tom Lane)
</para>
<para>
This is consistent with the notion that this represents zero
applications of the simple field/element extraction
operator <literal>-></>. Similarly, <type>json</type>
<literal>#>></> <type>text[]</> with an empty array merely
coerces its lefthand input to text.
</para>
</listitem>
<listitem>
<para>
Corner cases in
the <link linkend="functions-json-op-table"><type>JSON</type>
field/element/path extraction operators</link> now return NULL rather
than raising an error (Tom Lane)
</para>
<para>
For example, applying field extraction to a JSON array now yields NULL
not an error. This is more consistent (since some comparable cases such
as no-such-field already returned NULL), and it makes it safe to create
expression indexes that use these operators, since they will now not
throw errors for any valid JSON input.
</para>
</listitem>
<listitem>
<para>
Cause consecutive whitespace in <link
linkend="functions-formatting-table"><function>to_timestamp()</></link>
and <function>to_date()</> format strings to consume a corresponding
number of characters in the input string (whitespace or not), then
conditionally consume adjacent whitespace, if not in <literal>FX</>
mode (Jeevan Chalke)
</para>
<para>
Previously, consecutive whitespace characters in a non-<literal>FX</>
format string behaved like a single whitespace character and consumed
all adjacent whitespace in the input string. For example, previously
a format string of three spaces would consume only the first space in
<literal>' 12'</>, but it will now consume all three characters.
</para>
</listitem>
<listitem>
<para>
Fix <link
linkend="textsearch-functions-table"><function>ts_rank_cd()</></link>
to ignore stripped lexemes (Alex Hill)
</para>
<para>
Previously, stripped lexemes were treated as if they had a default
location, producing a rank of dubious usefulness.
</para>
</listitem>
<listitem>
<para>
For functions declared to
take <link linkend="xfunc-sql-variadic-functions"><literal>VARIADIC
"any"</></link>, an actual parameter marked as <literal>VARIADIC</>
must be of a determinable array type (Pavel Stehule)
</para>
<para>
Such parameters can no longer be written as an undecorated string
literal or <literal>NULL</>; a cast to an appropriate array data type
will now be required. Note that this does not affect parameters not
marked <literal>VARIADIC</>.
</para>
</listitem>
<listitem>
<para>
Ensure that whole-row variables expose the expected column names
to functions that pay attention to column names within composite
arguments (Tom Lane)
</para>
<para>
Constructs like <literal>row_to_json(tab.*)</> now always emit column
names that match the column aliases visible for table <literal>tab</>
at the point of the call. In previous releases the emitted column
names would sometimes be the table's actual column names regardless
of any aliases assigned in the query.
</para>
</listitem>
<listitem>
<para>
<xref linkend="sql-discard"> now also discards sequence-related state
(Fabrízio de Royes Mello, Robert Haas)
</para>
</listitem>
<listitem>
<para>
Rename <link linkend="SQL-EXPLAIN"><command>EXPLAIN
ANALYZE</></link>'s <quote>total runtime</quote> output
to <quote>execution time</quote> (Tom Lane)
</para>
<para>
Now that planning time is also reported, the previous name was
confusing.
</para>
</listitem>
<listitem>
<para>
<link linkend="SQL-SHOW"><command>SHOW TIME ZONE</></link> now
outputs simple numeric UTC offsets in <acronym>POSIX</> timezone
format (Tom Lane)
</para>
<para>
Previously, such timezone settings were displayed as <link
linkend="datatype-interval-output"><type>interval</></link> values.
The new output is properly interpreted by <command>SET TIME ZONE</>
when passed as a simple string, whereas the old output required
special treatment to be re-parsed correctly.
</para>
</listitem>
<listitem>
<para>
Foreign data wrappers that support updating foreign tables must
consider the possible presence of <literal>AFTER ROW</> triggers
(Noah Misch)
</para>
<para>
When an <literal>AFTER ROW</> trigger is present, all columns of the
table must be returned by updating actions, since the trigger might
inspect any or all of them. Previously, foreign tables never had
triggers, so the FDW might optimize away fetching columns not mentioned
in the <literal>RETURNING</> clause (if any).
</para>
</listitem>
<listitem>
<para>
Prevent <link
linkend="ddl-constraints-check-constraints"><literal>CHECK</></link>
constraints from referencing system columns, except
<structfield>tableoid</> (Amit Kapila)
</para>
<para>
Previously such check constraints were allowed, but they would often
cause errors during restores.
</para>
</listitem>
<listitem>
<para>
Use the last specified <link linkend="recovery-target-settings">recovery
target parameter</link> if multiple target parameters are specified
(Heikki Linnakangas)
</para>
<para>
Previously, there was an undocumented precedence order among
the <literal>recovery_target_<replaceable>xxx</></literal> parameters.
</para>
</listitem>
<listitem>
<para>
On Windows, automatically preserve quotes in command strings supplied
by the user (Heikki Linnakangas)
</para>
<para>
User commands that did their own quote preservation might need
adjustment. This is likely to be an issue for commands used in
<xref linkend="guc-archive-command">, <xref linkend="restore-command">,
and <link linkend="sql-copy"><command>COPY TO/FROM PROGRAM</></link>.
</para>
</listitem>
<listitem>
<para>
Remove catalog column <link
linkend="catalog-pg-class"><structfield>pg_class.reltoastidxid</></link>
(Michael Paquier)
</para>
</listitem>
<listitem>
<para>
Remove catalog column <link
linkend="catalog-pg-rewrite"><structfield>pg_rewrite.ev_attr</></link>
(Kevin Grittner)
</para>
<para>
Per-column rules have not been supported since
<application>PostgreSQL</> 7.3.
</para>
</listitem>
<listitem>
<para>
Remove native support for <application>Kerberos</> authentication
(<option>--with-krb5</>, etc)
(Magnus Hagander)
</para>
<para>
The supported way to use <application>Kerberos</> authentication is
with <acronym>GSSAPI</>. The native code has been deprecated since
<productname>PostgreSQL</> 8.3.
</para>
</listitem>
<listitem>
<para>
In <application>PL/Python</>, handle domains over arrays like the
underlying array type (Rodolfo Campero)
</para>
<para>
Previously such values were treated as strings.
</para>
</listitem>
<listitem>
<para>
Make libpq's <link
linkend="libpq-pqconnectdbparams"><function>PQconnectdbParams()</></link>
and <link
linkend="libpq-pqpingparams"><function>PQpingParams()</></link>
functions process zero-length strings as defaults (Adrian
Vondendriesch)
</para>
<para>
Previously, these functions treated zero-length string values as
selecting the default in only some cases.
</para>
</listitem>
<listitem>
<para>
Change empty arrays returned by the <xref linkend="intarray"> module
to be zero-dimensional arrays (Bruce Momjian)
</para>
<para>
Previously, empty arrays were returned as zero-length one-dimensional
arrays, whose text representation looked the same as zero-dimensional
arrays (<literal>{}</>), but they acted differently in array
operations. <application>intarray</>'s behavior in this area now
matches the built-in array operators.
</para>
</listitem>
<listitem>
<para>
<xref linkend="pgupgrade"> now uses <option>-U</>
or <option>--username</> to specify the user name (Bruce Momjian)
</para>
<para>
Previously this option was spelled <option>-u</> or <option>--user</>,
but that was inconsistent with other tools.
</para>
</listitem>
</itemizedlist>
</sect2>
<sect2>
<title>Changes</title>
<para>
Below you will find a detailed account of the changes between
<productname>PostgreSQL</productname> 9.4 and the previous major
release.
</para>
<sect3>
<title>Server</title>
<itemizedlist>
<listitem>
<para>
Allow <link linkend="bgworker">background worker processes</link>
to be dynamically registered, started and terminated (Robert Haas)
</para>
<para>
The new <filename>worker_spi</> module shows an example of use
of this feature.
</para>
</listitem>
<listitem>
<para>
Allow dynamic allocation of shared memory segments (Robert Haas,
Amit Kapila)
</para>
<para>
This feature is illustrated in the <filename>test_shm_mq</filename>
module.
</para>
</listitem>
<listitem>
<para>
During crash recovery or immediate shutdown, send uncatchable
termination signals (<systemitem>SIGKILL</>) to child processes
that do not shut down promptly (MauMau, Álvaro Herrera)
</para>
<para>
This reduces the likelihood of leaving orphaned child processes
behind after <xref linkend="app-postmaster"> shutdown, as well
as ensuring that crash recovery can proceed if some child processes
have become <quote>stuck</>.
</para>
</listitem>
<listitem>
<para>
Improve randomness of the database system identifier (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="SQL-VACUUM"> properly report dead but
not-yet-removable rows to the statistics collector (Hari Babu)
</para>
<para>
Previously these were reported as live rows.
</para>
</listitem>
</itemizedlist>
<sect4>
<title>Indexes</title>
<itemizedlist>
<listitem>
<para>
Reduce <link linkend="GIN"><acronym>GIN</></link> index size
(Alexander Korotkov, Heikki Linnakangas)
</para>
<para>
Indexes upgraded via <xref linkend="pgupgrade"> will work fine
but will still be in the old, larger <acronym>GIN</> format.
Use <xref linkend="SQL-REINDEX"> to recreate old GIN indexes in the
new format.
</para>
</listitem>
<listitem>
<para>
Improve speed of multi-key <link
linkend="GIN"><acronym>GIN</></link> lookups (Alexander Korotkov,
Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Add <link linkend="GiST"><acronym>GiST</></link> index support
for <link linkend="datatype-inet"><type>inet</></link> and
<link linkend="datatype-cidr"><type>cidr</></link> data types
(Emre Hasegeli)
</para>
<para>
Such indexes improve <link
linkend="cidr-inet-operators-table">subnet and supernet</link>
lookups and ordering comparisons.
</para>
</listitem>
<listitem>
<para>
Fix rare race condition in B-tree page deletion (Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Make the handling of interrupted B-tree page splits more robust
(Heikki Linnakangas)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>General Performance</title>
<itemizedlist>
<listitem>
<para>
Allow multiple backends to insert
into <link linkend="wal"><acronym>WAL</></link> buffers
concurrently (Heikki Linnakangas)
</para>
<para>
This improves parallel write performance.
</para>
</listitem>
<listitem>
<para>
Conditionally write only the modified portion of updated rows to
<link linkend="wal"><acronym>WAL</></link> (Amit Kapila)
</para>
</listitem>
<listitem>
<para>
Improve performance of aggregate functions used as <link
linkend="syntax-window-functions">window functions</link>
(David Rowley, Florian Pflug, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Improve speed of aggregates that
use <link linkend="datatype-numeric"><type>numeric</></link> state
values (Hadi Moshayedi)
</para>
</listitem>
<listitem>
<para>
Attempt to <link linkend="vacuum-for-wraparound">freeze</link>
tuples when tables are rewritten with <xref
linkend="SQL-CLUSTER"> or <link
linkend="SQL-VACUUM"><command>VACUUM FULL</></link> (Robert Haas,
Andres Freund)
</para>
<para>
This can avoid the need to freeze the tuples in the future.
</para>
</listitem>
<listitem>
<para>
Improve speed of <xref linkend="SQL-COPY"> with default <link
linkend="functions-sequence-table"><function>nextval()</></link>
columns (Simon Riggs)
</para>
</listitem>
<listitem>
<para>
Improve speed of accessing many different <link
linkend="SQL-CREATESEQUENCE">sequences</link> in the same session
(David Rowley)
</para>
</listitem>
<listitem>
<para>
Raise hard limit on the number of tuples held in memory during sorting
and B-tree index builds (Noah Misch)
</para>
</listitem>
<listitem>
<para>
Reduce memory allocated by <application>PL/pgSQL</>
<xref linkend="SQL-DO"> blocks (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make the planner more aggressive about extracting restriction clauses
from mixed <literal>AND</>/<literal>OR</> clauses (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Disallow pushing volatile <literal>WHERE</> clauses down
into <literal>DISTINCT</> subqueries (Tom Lane)
</para>
<para>
Pushing down a <literal>WHERE</> clause can produce a more
efficient plan overall, but at the cost of evaluating the clause
more often than is implied by the text of the query; so don't do it
if the clause contains any volatile functions.
</para>
</listitem>
<listitem>
<para>
Auto-resize the catalog caches (Heikki Linnakangas)
</para>
<para>
This reduces memory consumption for sessions accessing only a few
tables, and improves performance for sessions accessing many tables.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Monitoring</title>
<itemizedlist>
<listitem>
<para>
Add <xref linkend="pg-stat-archiver-view"> system view to
report <link linkend="wal"><acronym>WAL</></link> archiver activity
(Gabriele Bartolini)
</para>
</listitem>
<listitem>
<para>
Add <structfield>n_mod_since_analyze</> columns to
<xref linkend="pg-stat-all-tables-view"> and related system views
(Mark Kirkwood)
</para>
<para>
These columns expose the system's estimate of the number of changed
tuples since the table's last <xref linkend="sql-analyze">. This
estimate drives decisions about when to auto-analyze.
</para>
</listitem>
<listitem>
<para>
Add <structfield>backend_xid</> and <structfield>backend_xmin</>
columns to the system view <xref linkend="pg-stat-activity-view">,
and a <structfield>backend_xmin</> column to
<xref linkend="pg-stat-replication-view"> (Christian Kruse)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><acronym>SSL</></title>
<itemizedlist>
<listitem>
<para>
Add support for <acronym>SSL</> <acronym>ECDH</> key exchange
(Marko Kreen)
</para>
<para>
This allows use of Elliptic Curve keys for server authentication.
Such keys are faster and have better security than <acronym>RSA</>
keys. The new configuration parameter
<xref linkend="guc-ssl-ecdh-curve">
controls which curve is used for <acronym>ECDH</>.
</para>
</listitem>
<listitem>
<para>
Improve the default <xref linkend="guc-ssl-ciphers"> setting
(Marko Kreen)
</para>
</listitem>
<listitem>
<para>
By default, the server not the client now controls the preference
order of <acronym>SSL</> ciphers
(Marko Kreen)
</para>
<para>
Previously, the order specified by <xref linkend="guc-ssl-ciphers">
was usually ignored in favor of client-side defaults, which are not
configurable in most <productname>PostgreSQL</> clients. If
desired, the old behavior can be restored via the new configuration
parameter <xref linkend="guc-ssl-prefer-server-ciphers">.
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="guc-log-connections"> show <acronym>SSL</>
encryption information (Andreas Kunert)
</para>
</listitem>
<listitem>
<para>
Improve <acronym>SSL</> renegotiation handling (Álvaro
Herrera)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Server Settings</title>
<itemizedlist>
<listitem>
<para>
Add new <acronym>SQL</> command <xref linkend="SQL-ALTERSYSTEM">
for changing <filename>postgresql.conf</> configuration file entries
(Amit Kapila)
</para>
<para>
Previously such settings could only be changed by manually
editing <filename>postgresql.conf</>.
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="guc-autovacuum-work-mem"> configuration parameter
to control the amount of memory used by autovacuum workers
(Peter Geoghegan)
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="guc-huge-pages"> parameter to allow using huge
memory pages on Linux (Christian Kruse, Richard Poole, Abhijit
Menon-Sen)
</para>
<para>
This can improve performance on large-memory systems.
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="guc-max-worker-processes"> parameter
to limit the number of background workers (Robert Haas)
</para>
<para>
This is helpful in configuring a standby server to have the
required number of worker processes (the same as the primary).
</para>
</listitem>
<listitem>
<para>
Add superuser-only <xref linkend="guc-session-preload-libraries">
parameter to load libraries at session start (Peter Eisentraut)
</para>
<para>
In contrast to <xref linkend="guc-local-preload-libraries">, this
parameter can load any shared library, not just those in
the <filename>$libdir/plugins</> directory.
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="guc-wal-log-hints"> parameter to enable WAL
logging of hint-bit changes (Sawada Masahiko)
</para>
<para>
Hint bit changes are not normally logged, except when checksums are
enabled. This is useful for external tools
like <application>pg_rewind</>.
</para>
</listitem>
<listitem>
<para>
Increase the default settings of <xref linkend="guc-work-mem">
and <xref linkend="guc-maintenance-work-mem"> by four times (Bruce
Momjian)
</para>
<para>
The new defaults are 4MB and 64MB respectively.
</para>
</listitem>
<listitem>
<para>
Increase the default setting of <xref
linkend="guc-effective-cache-size">
to 4GB (Bruce Momjian, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Allow <function>printf</function>-style space padding to be
specified in <xref linkend="guc-log-line-prefix"> (David Rowley)
</para>
</listitem>
<listitem>
<para>
Allow terabyte units (<literal>TB</>) to be used when specifying
configuration variable values (Simon Riggs)
</para>
</listitem>
<listitem>
<para>
Show <acronym>PID</>s of lock holders and waiters and improve
information about relations in <xref linkend="guc-log-lock-waits">
log messages (Christian Kruse)
</para>
</listitem>
<listitem>
<para>
Reduce server logging level when loading shared libraries (Peter
Geoghegan)
</para>
<para>
The previous level was <literal>LOG</>, which was too verbose
for libraries loaded per-session.
</para>
</listitem>
<listitem>
<para>
On Windows, make <literal>SQL_ASCII</>-encoded databases and server
processes (e.g., <xref linkend="app-postmaster">) emit messages in
the character encoding of the server's Windows user locale
(Alexander Law, Noah Misch)
</para>
<para>
Previously these messages were output in the Windows
<acronym>ANSI</> code page.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Replication and Recovery</title>
<itemizedlist>
<listitem>
<para>
Add <link linkend="streaming-replication-slots">replication
slots</link> to coordinate activity on streaming standbys with the
node they are streaming from (Andres Freund, Robert Haas)
</para>
<para>
Replication slots allow preservation of resources like
<acronym>WAL</> files on the primary until they are no longer
needed by standby servers.
</para>
</listitem>
<listitem>
<para>
Add recovery parameter <xref linkend="recovery-min-apply-delay">
to delay replication (Robert Haas, Fabrízio de Royes Mello,
Simon Riggs)
</para>
<para>
Delaying replay on standby servers can be useful for recovering
from user errors.
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="recovery-target">
option <option>immediate</> to stop <link
linkend="wal"><acronym>WAL</></link> recovery as soon as a
consistent state is reached (MauMau, Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Improve recovery target processing (Heikki Linnakangas)
</para>
<para>
The timestamp reported
by <link linkend="functions-recovery-info-table"><function>pg_last_xact_replay_timestamp()</></link>
now reflects already-committed records, not transactions about to
be committed. Recovering to a restore point now replays the restore
point, rather than stopping just before the restore point.
</para>
</listitem>
<listitem>
<para>
<link
linkend="functions-admin-backup-table"><function>pg_switch_xlog()</></link>
now clears any unused trailing space in the old <acronym>WAL</> file
(Heikki Linnakangas)
</para>
<para>
This improves the compression ratio for <acronym>WAL</> files.
</para>
</listitem>
<listitem>
<para>
Report failure return codes from <link
linkend="archive-recovery-settings">external recovery commands</>
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Reduce spinlock contention during <acronym>WAL</> replay (Heikki
Linnakangas)
</para>
</listitem>
<listitem>
<para>
Write <acronym>WAL</> records of running transactions more
frequently (Andres Freund)
</para>
<para>
This allows standby servers to start faster and clean up resources
more aggressively.
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="logicaldecoding">Logical Decoding</></title>
<para>
Logical decoding allows database changes to be streamed in a
configurable format. The data is read from
the <link linkend="wal"><acronym>WAL</></link> and transformed into the
desired target format. To implement this feature, the following changes
were made:
</para>
<itemizedlist>
<listitem>
<para>
Add support for <link linkend="logicaldecoding">logical decoding</>
of WAL data, to allow database changes to be streamed out in a
customizable format
(Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add new <xref linkend="guc-wal-level"> setting <option>logical</>
to enable logical change-set encoding in <acronym>WAL</> (Andres
Freund)
</para>
</listitem>
<listitem>
<para>
Add table-level parameter <link
linkend="catalog-pg-class"><literal>REPLICA IDENTITY</></link>
to control logical replication (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add relation option <link
linkend="SQL-CREATETABLE-storage-parameters"><option>user_catalog_table</></link>
to identify user-created tables involved in logical change-set
encoding (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="app-pgrecvlogical"> application to receive
logical-decoding data (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="test-decoding"> module to illustrate logical
decoding at the <acronym>SQL</> level (Andres Freund)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Queries</title>
<itemizedlist>
<listitem>
<para>
Add <link linkend="queries-tablefunctions"><literal>WITH
ORDINALITY</></link> syntax to number the rows returned from a
set-returning function in the <literal>FROM</> clause
(Andrew Gierth, David Fetter)
</para>
<para>
This is particularly useful for functions like
<function>unnest()</>.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="queries-tablefunctions"><literal>ROWS
FROM()</></link> syntax to allow horizontal concatenation of
set-returning functions in the <literal>FROM</> clause (Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Allow <xref linkend="SQL-SELECT"> to have
an empty target list (Tom Lane)
</para>
<para>
This was added so that views that select from a table with zero
columns can be dumped and restored correctly.
</para>
</listitem>
<listitem>
<para>
Ensure that <link linkend="SQL-SELECT"><literal>SELECT ... FOR UPDATE
NOWAIT</></link> does not wait in corner cases involving
already-concurrently-updated tuples (Craig Ringer and Thomas Munro)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Utility Commands</title>
<itemizedlist>
<listitem>
<para>
Add <link linkend="SQL-DISCARD"><command>DISCARD
SEQUENCES</></link> command to discard cached sequence-related state
(Fabrízio de Royes Mello, Robert Haas)
</para>
<para>
<command>DISCARD ALL</> will now also discard such information.
</para>
</listitem>
<listitem>
<para>
Add <literal>FORCE NULL</> option
to <link linkend="SQL-COPY"><command>COPY FROM</></link>, which
causes quoted strings matching the specified null string to be
converted to NULLs in <literal>CSV</> mode (Ian Barwick, Michael
Paquier)
</para>
<para>
Without this option, only unquoted matching strings will be imported
as null values.
</para>
</listitem>
<listitem>
<para>
Issue warnings for commands used outside of transaction blocks
when they can have no effect (Bruce Momjian)
</para>
<para>
New warnings are issued for <command>SET
LOCAL</>, <command>SET CONSTRAINTS</>, <command>SET TRANSACTION</> and
<command>ABORT</> when used outside a transaction block.
</para>
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="SQL-EXPLAIN"></title>
<itemizedlist>
<listitem>
<para>
Make <command>EXPLAIN ANALYZE</> show planning time (Andreas
Karlsson)
</para>
</listitem>
<listitem>
<para>
Make <command>EXPLAIN</> show the grouping columns in Agg and
Group nodes (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make <command>EXPLAIN ANALYZE</> show exact and lossy
block counts in bitmap heap scans (Etsuro Fujita)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Views</title>
<itemizedlist>
<listitem>
<para>
Allow a <link linkend="rules-materializedviews">materialized view</>
to be refreshed without blocking other sessions from reading the view
meanwhile (Kevin Grittner)
</para>
<para>
This is done with <link
linkend="SQL-REFRESHMATERIALIZEDVIEW"><command>REFRESH MATERIALIZED
VIEW CONCURRENTLY</></link>.
</para>
</listitem>
<listitem>
<para>
Allow views to be <link
linkend="SQL-CREATEVIEW-updatable-views">automatically
updated</link> even if they contain some non-updatable columns
(Dean Rasheed)
</para>
<para>
Previously the presence of non-updatable output columns such as
expressions, literals, and function calls prevented automatic
updates. Now <command>INSERT</>s, <command>UPDATE</>s and
<command>DELETE</>s are supported, provided that they do not
attempt to assign new values to any of the non-updatable columns.
</para>
</listitem>
<listitem>
<para>
Allow control over whether <command>INSERT</>s and
<command>UPDATE</>s can add rows to an auto-updatable view that
would not appear in the view (Dean Rasheed)
</para>
<para>
This is controlled with the new <xref linkend="SQL-CREATEVIEW">
clause <literal>WITH CHECK OPTION</>.
</para>
</listitem>
<listitem>
<para>
Allow <link linkend="rules-privileges">security barrier views</>
to be automatically updatable (Dean Rasheed)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Object Manipulation</title>
<itemizedlist>
<listitem>
<para>
Support triggers on <link linkend="SQL-CREATEFOREIGNTABLE">foreign
tables</> (Ronan Dunklau)
</para>
</listitem>
<listitem>
<para>
Allow moving groups of objects from one tablespace to another
using the <literal>ALL IN TABLESPACE ... SET TABLESPACE</> form of
<xref linkend="SQL-ALTERTABLE">, <xref linkend="SQL-ALTERINDEX">, or
<xref linkend="SQL-ALTERMATERIALIZEDVIEW"> (Stephen Frost)
</para>
</listitem>
<listitem>
<para>
Allow changing foreign key constraint deferrability
via <xref linkend="SQL-ALTERTABLE"> ... <literal>ALTER
CONSTRAINT</> (Simon Riggs)
</para>
</listitem>
<listitem>
<para>
Reduce lock strength for some <xref linkend="SQL-ALTERTABLE">
commands
(Simon Riggs, Noah Misch, Robert Haas)
</para>
<para>
Specifically, <literal>VALIDATE CONSTRAINT</>, <literal>CLUSTER
ON</>, <literal>SET WITHOUT CLUSTER</>, <literal>ALTER COLUMN
SET STATISTICS</>, <literal>ALTER COLUMN</> <literal>SET</>
<option>(attribute_option)</>, <literal>ALTER COLUMN RESET</>
<option>(attribute_option)</> no longer require <literal>ACCESS
EXCLUSIVE</> locks.
</para>
</listitem>
<listitem>
<para>
Allow tablespace options to be set
in <xref linkend="SQL-CREATETABLESPACE"> (Vik Fearing)
</para>
<para>
Formerly these options could only be set
via <xref linkend="SQL-ALTERTABLESPACE">.
</para>
</listitem>
<listitem>
<para>
Allow <xref linkend="SQL-CREATEAGGREGATE"> to define the estimated
size of the aggregate's transition state data (Hadi Moshayedi)
</para>
<para>
Proper use of this feature allows the planner to better estimate
how much memory will be used by aggregates.
</para>
</listitem>
<listitem>
<para>
Fix <command>DROP IF EXISTS</> to avoid errors for non-existent
objects in more cases (Pavel Stehule, Dean Rasheed)
</para>
</listitem>
<listitem>
<para>
Improve how system relations are identified (Andres Freund,
Robert Haas)
</para>
<para>
Previously, relations once moved into the <literal>pg_catalog</>
schema could no longer be modified or dropped.
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Data Types</title>
<itemizedlist>
<listitem>
<para>
Fully implement the <link
linkend="datatype-line"><type>line</></link> data type (Peter
Eisentraut)
</para>
<para>
The line <emphasis>segment</> data type (<link
linkend="datatype-lseg"><type>lseg</></link>) has always been
fully supported. The previous <type>line</> data type (which was
enabled only via a compile-time option) is not binary or
dump-compatible with the new implementation.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="datatype-pg-lsn"><type>pg_lsn</></link>
data type to represent a <acronym>WAL</> log sequence number
(<acronym>LSN</>) (Robert Haas, Michael Paquier)
</para>
</listitem>
<listitem>
<para>
Allow single-point <link
linkend="datatype-polygon"><type>polygon</></link>s to be converted
to <link linkend="datatype-circle"><type>circle</></link>s
(Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Support time zone abbreviations that change UTC offset from time to
time (Tom Lane)
</para>
<para>
Previously, <productname>PostgreSQL</> assumed that the UTC offset
associated with a time zone abbreviation (such as <literal>EST</>)
never changes in the usage of any particular locale. However this
assumption fails in the real world, so introduce the ability for a
zone abbreviation to represent a UTC offset that sometimes changes.
Update the zone abbreviation definition files to make use of this
feature in timezone locales that have changed the UTC offset of their
abbreviations since 1970 (according to the IANA timezone database).
In such timezones, <productname>PostgreSQL</> will now associate the
correct UTC offset with the abbreviation depending on the given date.
</para>
</listitem>
<listitem>
<para>
Allow 5+ digit years for non-<acronym>ISO</> <link
linkend="datatype-datetime"><type>timestamp</></link> and
<type>date</> strings, where appropriate (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Add checks for overflow/underflow of <link
linkend="datatype-datetime"><type>interval</></link> values
(Bruce Momjian)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="datatype-json"><acronym>JSON</></link></title>
<itemizedlist>
<listitem>
<para>
Add <link linkend="datatype-json"><type>jsonb</></link>, a more
capable and efficient data type for storing <acronym>JSON</> data
(Oleg Bartunov, Teodor Sigaev, Alexander
Korotkov, Peter Geoghegan, Andrew Dunstan)
</para>
<para>
This new type allows faster access to values within a JSON
document, and faster and more useful indexing of JSON columns.
Scalar values in <type>jsonb</> documents are stored as appropriate
scalar SQL types, and the JSON document structure is pre-parsed
rather than being stored as text as in the original <type>json</>
data type.
</para>
</listitem>
<listitem>
<para>
Add new JSON functions to allow for the construction
of arbitrarily complex JSON trees (Andrew Dunstan, Laurence Rowe)
</para>
<para>
New functions include <link
linkend="functions-json-processing-table"><function>json_array_elements_text()</></link>,
<function>json_build_array()</>, <function>json_object()</>,
<function>json_object_agg()</>, <function>json_to_record()</>,
and <function>json_to_recordset()</>.
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="functions-json-processing-table"><function>json_typeof()</></link>
to return the data type of a <type>json</> value (Andrew Tipton)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Functions</title>
<itemizedlist>
<listitem>
<para>
Add <link
linkend="functions-datetime-delay"><function>pg_sleep_for(interval)</></link>
and <function>pg_sleep_until(timestamp)</> to specify
delays more flexibly (Vik Fearing, Julien Rouhaud)
</para>
<para>
The existing <function>pg_sleep()</> function only supports delays
specified in seconds.
</para>
</listitem>
<listitem>
<para>
Add <link
linkend="array-functions-table"><function>cardinality()</></link>
function for arrays (Marko Tiikkaja)
</para>
<para>
This returns the total number of elements in the array, or zero
for an array with no elements.
</para>
</listitem>
<listitem>
<para>
Add <acronym>SQL</> functions to allow <link linkend="lo-funcs">large
object reads/writes</link> at arbitrary offsets (Pavel Stehule)
</para>
</listitem>
<listitem>
<para>
Allow <link
linkend="array-functions-table"><function>unnest()</></link>
to take multiple arguments, which are individually unnested then
horizontally concatenated (Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Add functions to construct <type>time</>s, <type>date</>s,
<type>timestamp</>s, <type>timestamptz</>s, and <type>interval</>s
from individual values, rather than strings (Pavel Stehule)
</para>
<para>
These functions' names are prefixed with <literal>make_</>,
e.g. <link linkend="functions-datetime-table"><function>make_date()</></link>.
</para>
</listitem>
<listitem>
<para>
Make <link
linkend="functions-formatting-table"><function>to_char()</></link>'s
<literal>TZ</> format specifier return a useful value for simple
numeric time zone offsets (Tom Lane)
</para>
<para>
Previously, <literal>to_char(CURRENT_TIMESTAMP, 'TZ')</> returned
an empty string if the <literal>timezone</> was set to a constant
like <literal>-4</>.
</para>
</listitem>
<listitem>
<para>
Add timezone offset format specifier <literal>OF</> to <link
linkend="functions-formatting-table"><function>to_char()</></link>
(Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Improve the random seed used for <link
linkend="functions-math-random-table"><function>random()</></link>
(Honza Horak)
</para>
</listitem>
<listitem>
<para>
Tighten validity checking for Unicode code points in <link
linkend="functions-string-other"><function>chr(int)</></link>
(Tom Lane)
</para>
<para>
This function now only accepts values that are valid UTF8 characters
according to RFC 3629.
</para>
</listitem>
</itemizedlist>
<sect4>
<title>System Information Functions</title>
<itemizedlist>
<listitem>
<para>
Add functions for looking up objects in <structname>pg_class</>,
<structname>pg_proc</>, <structname>pg_type</>, and
<structname>pg_operator</> that do not generate errors for
non-existent objects (Yugo Nagata, Nozomi Anzai,
Robert Haas)
</para>
<para>
For example, <link
linkend="functions-info-catalog-table"><function>to_regclass()</></link>
does a lookup in <structname>pg_class</> similarly to
the <type>regclass</> input function, but it returns NULL for a
non-existent object instead of failing.
</para>
</listitem>
<listitem>
<para>
Add function <link
linkend="functions-admin-dblocation"><function>pg_filenode_relation()</></link>
to allow for more efficient lookup of relation names from filenodes
(Andres Freund)
</para>
</listitem>
<listitem>
<para>
Add <structfield>parameter_default</> column to <link
linkend="infoschema-parameters"><structname>information_schema.parameters</></link>
view (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Make <link
linkend="infoschema-schemata"><structname>information_schema.schemata</></link>
show all accessible schemas (Peter Eisentraut)
</para>
<para>
Previously it only showed schemas owned by the current user.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title>Aggregates</title>
<itemizedlist>
<listitem>
<para>
Add control over which rows are passed
into aggregate functions via the <link
linkend="syntax-aggregates"><literal>FILTER</></link> clause
(David Fetter)
</para>
</listitem>
<listitem>
<para>
Support ordered-set (<link
linkend="syntax-aggregates"><literal>WITHIN GROUP</></link>)
aggregates (Atri Sharma, Andrew Gierth, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Add standard ordered-set aggregates <link
linkend="functions-orderedset-table"><function>percentile_cont()</></link>,
<function>percentile_disc()</>, <function>mode()</>, <link
linkend="functions-hypothetical-table"><function>rank()</></link>,
<function>dense_rank()</>, <function>percent_rank()</>, and
<function>cume_dist()</>
(Atri Sharma, Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Support <link
linkend="xfunc-sql-variadic-functions"><literal>VARIADIC</></link>
aggregate functions (Tom Lane)
</para>
</listitem>
<listitem>
<para>
Allow polymorphic aggregates to have non-polymorphic state data
types (Tom Lane)
</para>
<para>
This allows proper declaration in SQL of aggregates like the built-in
aggregate <function>array_agg()</>.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Server-Side Languages</title>
<itemizedlist>
<listitem>
<para>
Add event trigger support to <link linkend="plperl">PL/Perl</>
and <link linkend="pltcl">PL/Tcl</> (Dimitri Fontaine)
</para>
</listitem>
<listitem>
<para>
Convert <link linkend="datatype-numeric"><type>numeric</></link>
values to <type>decimal</> in <link linkend="plpython">PL/Python</link>
(Szymon Guz, Ronan Dunklau)
</para>
<para>
Previously such values were converted to Python <type>float</> values,
risking loss of precision.
</para>
</listitem>
</itemizedlist>
<sect4>
<title><link linkend="plpgsql">PL/pgSQL</link> Server-Side Language</title>
<itemizedlist>
<listitem>
<para>
Add ability to retrieve the current PL/PgSQL call stack
using <link linkend="plpgsql-call-stack"><command>GET
DIAGNOSTICS</></link>
(Pavel Stehule, Stephen Frost)
</para>
</listitem>
<listitem>
<para>
Add option <link
linkend="plpgsql-statements-sql-onerow"><option>print_strict_params</></link>
to display the parameters passed to a query that violated a
<literal>STRICT</> constraint (Marko Tiikkaja)
</para>
</listitem>
<listitem>
<para>
Add variables <link
linkend="plpgsql-extra-checks"><varname>plpgsql.extra_warnings</></link>
and <varname>plpgsql.extra_errors</> to enable additional PL/pgSQL
warnings and errors (Marko Tiikkaja, Petr Jelinek)
</para>
<para>
Currently only warnings/errors about shadowed variables are available.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title><link linkend="libpq"><application>libpq</></link></title>
<itemizedlist>
<listitem>
<para>
Make libpq's <link
linkend="libpq-pqconndefaults"><function>PQconndefaults()</></link>
function ignore invalid service files (Steve Singer, Bruce Momjian)
</para>
<para>
Previously it returned NULL if an incorrect service file was
encountered.
</para>
</listitem>
<listitem>
<para>
Accept <acronym>TLS</> protocol versions beyond <literal>TLSv1</>
in libpq (Marko Kreen)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Client Applications</title>
<itemizedlist>
<listitem>
<para>
Add <xref linkend="APP-CREATEUSER"> option <option>-g</>
to specify role membership (Chistopher Browne)
</para>
</listitem>
<listitem>
<para>
Add <xref linkend="APP-VACUUMDB">
option <option>--analyze-in-stages</> to analyze in stages of
increasing granularity (Peter Eisentraut)
</para>
<para>
This allows minimal statistics to be created quickly.
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="APP-PGRESETXLOG"> with option <option>-n</>
output current and potentially changed values (Rajeev Rastogi)
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="app-initdb"> throw error for incorrect locale
settings, rather than silently falling back to a default choice
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="app-pg-ctl"> return exit code <literal>4</> for
an inaccessible data directory (Amit Kapila, Bruce Momjian)
</para>
<para>
This behavior more closely matches the Linux Standard Base
(<acronym>LSB</>) Core Specification.
</para>
</listitem>
<listitem>
<para>
On Windows, ensure that a non-absolute <option>-D</> path
specification is interpreted relative
to <xref linkend="app-pg-ctl">'s current directory
(Kumar Rajeev Rastogi)
</para>
<para>
Previously it would be interpreted relative to whichever directory
the underlying Windows service was started in.
</para>
</listitem>
<listitem>
<para>
Allow <function>sizeof()</> in <link linkend="ecpg">ECPG</link>
C array definitions (Michael Meskes)
</para>
</listitem>
<listitem>
<para>
Make <link linkend="ecpg">ECPG</link> properly handle nesting
of C-style comments in both C and <acronym>SQL</> text
(Michael Meskes)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="APP-PSQL"></title>
<itemizedlist>
<listitem>
<para>
Suppress <quote>No rows</quote> output in <application>psql</> <link
linkend="APP-PSQL-meta-commands"><option>expanded</></link>
mode when the footer is disabled (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Allow Control-C to abort <application>psql</> when it's hung at
connection startup (Peter Eisentraut)
</para>
</listitem>
</itemizedlist>
<sect5>
<title><link linkend="APP-PSQL-meta-commands">Backslash Commands</link></title>
<itemizedlist>
<listitem>
<para>
Make <application>psql</>'s <command>\db+</> show tablespace options
(Magnus Hagander)
</para>
</listitem>
<listitem>
<para>
Make <command>\do+</> display the functions
that implement the operators (Marko Tiikkaja)
</para>
</listitem>
<listitem>
<para>
Make <command>\d+</> output an
<literal>OID</> line only if an <literal>oid</literal> column
exists in the table (Bruce Momjian)
</para>
<para>
Previously, the presence or absence of an <literal>oid</literal>
column was always reported.
</para>
</listitem>
<listitem>
<para>
Make <command>\d</> show disabled system triggers (Bruce
Momjian)
</para>
<para>
Previously, if you disabled all triggers, only user triggers
would show as disabled.
</para>
</listitem>
<listitem>
<para>
Fix <command>\copy</> to no longer require
a space between <literal>stdin</> and a semicolon (Etsuro Fujita)
</para>
</listitem>
<listitem>
<para>
Output the row count at the end of <command>\copy</>, just
like <command>COPY</> already did (Kumar Rajeev Rastogi)
</para>
</listitem>
<listitem>
<para>
Fix <command>\conninfo</> to display the
server's <acronym>IP</> address for connections using
<literal>hostaddr</> (Fujii Masao)
</para>
<para>
Previously <command>\conninfo</> could not display the server's
<acronym>IP</> address in such cases.
</para>
</listitem>
<listitem>
<para>
Show the <acronym>SSL</> protocol version in
<command>\conninfo</> (Marko Kreen)
</para>
</listitem>
<listitem>
<para>
Add tab completion for <command>\pset</>
(Pavel Stehule)
</para>
</listitem>
<listitem>
<para>
Allow <command>\pset</> with no arguments
to show all settings (Gilles Darold)
</para>
</listitem>
<listitem>
<para>
Make <command>\s</> display the name of the history file it wrote
without converting it to an absolute path (Tom Lane)
</para>
<para>
The code previously attempted to convert a relative file name to
an absolute path for display, but frequently got it wrong.
</para>
</listitem>
</itemizedlist>
</sect5>
</sect4>
<sect4>
<title><xref linkend="APP-PGDUMP"></title>
<itemizedlist>
<listitem>
<para>
Allow <xref linkend="APP-PGRESTORE"> options
<option>-I</>, <option>-P</>, <option>-T</> and <option>-n</>
to be specified multiple times (Heikki Linnakangas)
</para>
<para>
This allows multiple objects to be restored in one operation.
</para>
</listitem>
<listitem>
<para>
Optionally add <literal>IF EXISTS</> clauses to the <command>DROP</>
commands emitted when removing old objects during a restore (Pavel
Stehule)
</para>
<para>
This change prevents unnecessary errors when removing old objects.
The new <option>--if-exists</> option
for <xref linkend="APP-PGDUMP">, <xref linkend="APP-PG-DUMPALL">,
and <xref linkend="APP-PGRESTORE"> is only available
when <option>--clean</> is also specified.
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="app-pgbasebackup"></title>
<itemizedlist>
<listitem>
<para>
Add <application>pg_basebackup</> option <option>--xlogdir</>
to specify the <filename>pg_xlog</> directory location (Haribabu
Kommi)
</para>
</listitem>
<listitem>
<para>
Allow <application>pg_basebackup</> to relocate tablespaces in
the backup copy (Steeve Lennmark)
</para>
<para>
This is particularly useful for using <application>pg_basebackup</>
on the same machine as the primary.
</para>
</listitem>
<listitem>
<para>
Allow network-stream base backups to be throttled (Antonin Houska)
</para>
<para>
This can be controlled with the <application>pg_basebackup</>
<option>--max-rate</> parameter.
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
<sect3>
<title>Source Code</title>
<itemizedlist>
<listitem>
<para>
Improve the way tuples are frozen to preserve forensic information
(Robert Haas, Andres Freund)
</para>
<para>
This change removes the main objection to freezing tuples as soon
as possible. Code that inspects tuple flag bits will need to be
modified.
</para>
</listitem>
<listitem>
<para>
No longer require function prototypes for functions marked with the
<link linkend="xfunc-c"><function>PG_FUNCTION_INFO_V1</></link>
macro (Peter Eisentraut)
</para>
<para>
This change eliminates the need to write boilerplate prototypes.
Note that the <function>PG_FUNCTION_INFO_V1</> macro must appear
before the corresponding function definition to avoid compiler
warnings.
</para>
</listitem>
<listitem>
<para>
Remove <varname>SnapshotNow</> and
<function>HeapTupleSatisfiesNow()</> (Robert Haas)
</para>
<para>
All existing uses have been switched to more appropriate snapshot
types. Catalog scans now use <acronym>MVCC</> snapshots.
</para>
</listitem>
<listitem>
<para>
Add an <acronym>API</> to allow memory allocations over one gigabyte
(Noah Misch)
</para>
</listitem>
<listitem>
<para>
Add <function>psprintf()</> to simplify memory allocation during
string composition (Peter Eisentraut, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Support <function>printf()</> size modifier <literal>z</> to
print <type>size_t</> values (Andres Freund)
</para>
</listitem>
<listitem>
<para>
Change <acronym>API</> of <function>appendStringInfoVA()</>
to better use <function>vsnprintf()</> (David Rowley, Tom Lane)
</para>
</listitem>
<listitem>
<para>
Allow new types of external toast datums to be created (Andres
Freund)
</para>
</listitem>
<listitem>
<para>
Add single-reader, single-writer, lightweight shared message queue
(Robert Haas)
</para>
</listitem>
<listitem>
<para>
Improve spinlock speed on x86_64 <acronym>CPU</>s (Heikki
Linnakangas)
</para>
</listitem>
<listitem>
<para>
Remove spinlock support for unsupported platforms
<productname>SINIX</>, <productname>Sun3</>, and
<productname>NS32K</> (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Remove <acronym>IRIX</> port (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Reduce the number of semaphores required by
<option>--disable-spinlocks</> builds (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Rewrite <application>duplicate_oids</> Unix shell script in
<application>Perl</> (Andrew Dunstan)
</para>
</listitem>
<listitem>
<para>
Add Test Anything Protocol (<acronym>TAP</>) tests for client
programs (Peter Eisentraut)
</para>
<para>
Currently, these tests are run by <literal>make check-world</>
only if the <option>--enable-tap-tests</> option was given
to <application>configure</>.
This might become the default behavior in some future release.
</para>
</listitem>
<listitem>
<para>
Add make targets <option>check-tests</> and
<option>installcheck-tests</>, which allow selection of individual
tests to be run (Andrew Dunstan)
</para>
</listitem>
<listitem>
<para>
Remove <option>maintainer-check</> makefile rule (Peter Eisentraut)
</para>
<para>
The default build rules now include all the formerly-optional tests.
</para>
</listitem>
<listitem>
<para>
Improve support for <envar>VPATH</> builds of <acronym>PGXS</>
modules (Cédric Villemain, Andrew Dunstan, Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Upgrade to Autoconf 2.69 (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Add a <application>configure</> flag that appends custom text to the
<envar>PG_VERSION</> string (Oskari Saarenmaa)
</para>
<para>
This is useful for packagers building custom binaries.
</para>
</listitem>
<listitem>
<para>
Improve DocBook <acronym>XML</> validity (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Fix various minor security and sanity issues reported by the
<productname>Coverity</> scanner (Stephen Frost)
</para>
</listitem>
<listitem>
<para>
Improve detection of invalid memory usage when testing
<productname>PostgreSQL</> with <application>Valgrind</>
(Noah Misch)
</para>
</listitem>
<listitem>
<para>
Improve sample <application>Emacs</> configuration file
<filename>emacs.samples</> (Peter Eisentraut)
</para>
<para>
Also add <filename>.dir-locals.el</> to the top of the source tree.
</para>
</listitem>
<listitem>
<para>
Allow <application>pgindent</> to accept a command-line list
of typedefs (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Make <application>pgindent</> smarter about blank lines
around preprocessor conditionals (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Avoid most uses of <command>dlltool</command>
in <productname>Cygwin</> and
<productname>Mingw</> builds (Marco Atzeri, Hiroshi Inoue)
</para>
</listitem>
<listitem>
<para>
Support client-only installs in <acronym>MSVC</> (Windows) builds
(MauMau)
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3>
<title>Additional Modules</title>
<itemizedlist>
<listitem>
<para>
Add <xref linkend="pgprewarm"> extension to preload relation data
into the shared buffer cache at server start (Robert Haas)
</para>
<para>
This allows reaching full operating performance more quickly.
</para>
</listitem>
<listitem>
<para>
Add <acronym>UUID</> random number generator
<function>gen_random_uuid()</> to <xref linkend="pgcrypto">
(Oskari Saarenmaa)
</para>
<para>
This allows creation of version 4 <acronym>UUID</>s without
requiring installation of <xref linkend="uuid-ossp">.
</para>
</listitem>
<listitem>
<para>
Allow <xref linkend="uuid-ossp"> to work with
the <systemitem>BSD</> or <systemitem>e2fsprogs</> UUID libraries,
not only the <systemitem>OSSP</> UUID library (Matteo Beccati)
</para>
<para>
This improves the <application>uuid-ossp</> module's portability
since it no longer has to have the increasingly-obsolete OSSP
library. The module's name is now rather a misnomer, but we won't
change it.
</para>
</listitem>
<listitem>
<para>
Add option to <xref linkend="auto-explain"> to include trigger
execution time (Horiguchi Kyotaro)
</para>
</listitem>
<listitem>
<para>
Fix <xref linkend="pgstattuple"> to not report rows from
uncommitted transactions as dead (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Make <xref linkend="pgstattuple"> functions
use <type>regclass</type>-type arguments (Satoshi Nagayasu)
</para>
<para>
While <type>text</type>-type arguments are still supported, they
may be removed in a future major release.
</para>
</listitem>
<listitem>
<para>
Improve consistency of <xref linkend="pgrowlocks"> output to honor
snapshot rules more consistently (Robert Haas)
</para>
</listitem>
<listitem>
<para>
Improve <xref linkend="pgtrgm">'s choice of trigrams for indexed
regular expression searches (Alexander Korotkov)
</para>
<para>
This change discourages use of trigrams containing whitespace, which
are usually less selective.
</para>
</listitem>
<listitem>
<para>
Allow <xref linkend="pgxlogdump"> to report a live log stream
with <option>--follow</> (Heikki Linnakangas)
</para>
</listitem>
<listitem>
<para>
Store <xref linkend="cube"> data more compactly (Stas Kelvich)
</para>
<para>
Existing data must be dumped/restored to use the new format.
The old format can still be read.
</para>
</listitem>
<listitem>
<para>
Reduce <xref linkend="vacuumlo"> client-side memory usage by using
a cursor (Andrew Dunstan)
</para>
</listitem>
<listitem>
<para>
Dramatically reduce memory consumption
in <xref linkend="pgupgrade"> (Bruce Momjian)
</para>
</listitem>
<listitem>
<para>
Pass <xref linkend="pgupgrade">'s user name (<option>-U</>) option to
generated analyze scripts (Bruce Momjian)
</para>
</listitem>
</itemizedlist>
<sect4>
<title><xref linkend="pgbench"></title>
<itemizedlist>
<listitem>
<para>
Remove line length limit for <application>pgbench</> scripts (Sawada
Masahiko)
</para>
<para>
The previous line limit was <envar>BUFSIZ</>.
</para>
</listitem>
<listitem>
<para>
Add long option names to <application>pgbench</> (Fabien Coelho)
</para>
</listitem>
<listitem>
<para>
Add <application>pgbench</> option <option>--rate</> to control
the transaction rate (Fabien Coelho)
</para>
</listitem>
<listitem>
<para>
Add <application>pgbench</> option <option>--progress</> to
print periodic progress reports
(Fabien Coelho)
</para>
</listitem>
</itemizedlist>
</sect4>
<sect4>
<title><xref linkend="pgstatstatements"></title>
<itemizedlist>
<listitem>
<para>
Make <application>pg_stat_statements</> use a file, rather than
shared memory, for query text storage (Peter Geoghegan)
</para>
<para>
This removes the previous limitation on query text length, and
allows a higher number of unique statements to be tracked by default.
</para>
</listitem>
<listitem>
<para>
Allow reporting of <application>pg_stat_statements</>'s internal
query hash identifier (Daniel Farina, Sameer Thakur, Peter
Geoghegan)
</para>
</listitem>
<listitem>
<para>
Add the ability to retrieve all <application>pg_stat_statements</>
information except the query text (Peter Geoghegan)
</para>
<para>
This allows monitoring tools to fetch query text only for
just-created entries, improving performance during repeated querying
of the statistics.
</para>
</listitem>
<listitem>
<para>
Make <application>pg_stat_statements</> ignore <command>DEALLOCATE</>
commands (Fabien Coelho)
</para>
<para>
It already ignored <command>PREPARE</>, as well as planning time in
general, so this seems more consistent.
</para>
</listitem>
<listitem>
<para>
Save the statistics file into <filename>$PGDATA/pg_stat</> at server
shutdown, rather than <filename>$PGDATA/global</> (Fujii Masao)
</para>
</listitem>
</itemizedlist>
</sect4>
</sect3>
</sect2>
</sect1>