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First-draft release notes for 9.4.2 et al. 

As usual, the release notes for older branches will be made by cutting
these down, but put them up for community review first.
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doc/src/sgml/release-9.4.sgml
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<!-- doc/src/sgml/release-9.4.sgml -->
<!-- See header comment in release.sgml about typical markup -->
<sect1 id="release-9-4-2">
<title>Release 9.4.2</title>
<note>
<title>Release Date</title>
<simpara>2015-05-21</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>
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Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Branch: master [b69bf30b9] 2015-04-28 11:32:53 -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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Author: Robert Haas <rhaas@postgresql.org>
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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
Branch: REL9_4_STABLE [ea70595a3] 2015-05-11 12:16:35 -0400
Branch: REL9_3_STABLE [ddebd2119] 2015-05-11 12:16:51 -0400
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<listitem>
<para>
Protect against wraparound of multixact member IDs
(&Aacute;lvaro 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.) Beware that either update
direction will require dropping and recreating any views or rules that
use <filename>citext</>'s <function>regexp_matches()</> functions.
</para>
</listitem>
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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>
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Author: Andrew Dunstan <andrew@dunslane.net>
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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>
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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>
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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>
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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>
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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
Branch: REL9_4_STABLE [fd3dfc236] 2015-04-28 00:18:04 +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
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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 (&Aacute;lvaro 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>
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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
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<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
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-->
<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
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-->
<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
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<listitem>
<para>
Fix crash when manipulating hash indexes on temporary tables
(Heikki Linnakangas)
</para>
<para>
This fault was introduced in the previous set of minor releases
as a byproduct of a race-condition fix.
</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
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-->
<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>
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Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [e4cbfd673] 2015-03-29 15:04:09 -0400
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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>
Improve object description strings for foreign-server user mappings
(&Aacute;lvaro Herrera)
</para>
<para>
Add the name of the target server, since otherwise it's ambiguous.
</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
(&Aacute;lvaro 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>
Guard against 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, &Aacute;lvaro 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 avoids a scenario in which a server previously promoted from
standby status couldn't be upgraded because of a missing WAL history
file.
</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
Branch: REL9_4_STABLE [5eef3c61e] 2015-02-11 22:06:04 -0500
Branch: REL9_3_STABLE [9ecd51da7] 2015-02-11 22:06:04 -0500
Branch: REL9_2_STABLE [66f5217f5] 2015-02-11 22:06:04 -0500
Branch: REL9_1_STABLE [08aaae40e] 2015-02-11 22:06:04 -0500
Branch: REL9_0_STABLE [4ae178f60] 2015-02-11 22:06:04 -0500
-->
<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
Branch: REL9_4_STABLE [c7bc5be11] 2015-02-11 21:02:36 -0500
Branch: REL9_3_STABLE [e20523f8f] 2015-02-11 21:02:28 -0500
Branch: REL9_2_STABLE [d99cf27b7] 2015-02-11 21:02:12 -0500
Branch: REL9_1_STABLE [55179b03e] 2015-02-11 21:02:07 -0500
Branch: REL9_0_STABLE [85dac37ee] 2015-02-11 21:02:06 -0500
-->
<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
Branch: REL9_4_STABLE [2366761bf] 2015-03-30 17:16:57 -0400
Branch: REL9_3_STABLE [0904eb3e1] 2015-03-30 17:17:17 -0400
Branch: REL9_2_STABLE [948566313] 2015-03-30 17:17:39 -0400
Branch: REL9_1_STABLE [22b3f5b26] 2015-03-30 17:17:54 -0400
Branch: REL9_0_STABLE [bf22a8e58] 2015-03-30 17:18:10 -0400
-->
<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
Branch: REL9_4_STABLE [5e49c98e0] 2015-02-17 10:50:49 -0500
Branch: REL9_3_STABLE [9a90ec9cf] 2015-02-17 10:54:29 -0500
Author: Robert Haas <rhaas@postgresql.org>
Branch: REL9_2_STABLE [319406c2a] 2015-02-17 11:02:46 -0500
Branch: REL9_1_STABLE [d7d294f59] 2015-02-17 11:08:40 -0500
-->
<listitem>
<para>
Improve handling of <function>readdir()</> failures when scanning
directories in <application>initdb</> and <application>pg_basebackup</>
(Marco Nenciarini)
</para>
</listitem>
<!--
Author: Andres Freund <andres@anarazel.de>
Branch: REL9_2_STABLE [6b700301c] 2015-02-17 16:03:00 +0100
-->
<listitem>
<para>
Fix failure in <application>pg_receivexlog</> (Andres Freund)
</para>
<para>
A patch merge mistake in 9.2.10 led to <quote>could not create archive
status file</> errors.
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [8d1f23900] 2015-03-15 23:22:03 -0400
Branch: REL9_4_STABLE [904e8b627] 2015-03-15 23:22:03 -0400
Branch: REL9_3_STABLE [83587a075] 2015-03-15 23:22:03 -0400
Branch: REL9_2_STABLE [8582ae7aa] 2015-03-15 23:22:03 -0400
Branch: REL9_1_STABLE [9288645b5] 2015-03-15 23:22:03 -0400
Branch: REL9_0_STABLE [40b0c10b7] 2015-03-15 23:22:03 -0400
-->
<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
Branch: REL9_3_STABLE [6ef5d894a] 2015-02-13 23:57:05 +0200
Branch: REL9_2_STABLE [a0d84da1d] 2015-02-13 23:57:25 +0200
Branch: REL9_1_STABLE [ebdc2e1e2] 2015-02-13 23:57:28 +0200
Branch: REL9_0_STABLE [61165fae0] 2015-02-13 23:57:35 +0200
-->
<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
Branch: REL9_4_STABLE [8972a152c] 2015-04-05 13:01:55 -0400
Branch: REL9_3_STABLE [6347bdb31] 2015-04-05 13:01:55 -0400
-->
<listitem>
<para>
Silence some build warnings on OS X (Tom Lane)
</para>
</listitem>
<!--
Author: Tom Lane <tgl@sss.pgh.pa.us>
Branch: master [9d366c1f3] 2015-05-15 19:35:29 -0400
Branch: REL9_4_STABLE [d0ddcf62e] 2015-05-15 19:35:51 -0400
Branch: REL9_3_STABLE [4fd69e412] 2015-05-15 19:35:58 -0400
Branch: REL9_2_STABLE [2a63434f0] 2015-05-15 19:36:06 -0400
Branch: REL9_1_STABLE [436f35609] 2015-05-15 19:36:13 -0400
Branch: REL9_0_STABLE [3c3749a3b] 2015-05-15 19:36:20 -0400
-->
<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>
......
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