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><DIV
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><H1
CLASS="SECT1"
><A
NAME="RELEASE-9-2-2"
>E.23. Release 9.2.2</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2012-12-06</P
></DIV
><P
> This release contains a variety of fixes from 9.2.1.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.25</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN114006"
>E.23.1. Migration to Version 9.2.2</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, you may need to perform <TT
CLASS="COMMAND"
>REINDEX</TT
> operations to
correct problems in concurrently-built indexes, as described in the first
changelog item below.
</P
><P
> Also, if you are upgrading from version 9.2.0,
see <A
HREF="release-9-2-1.html"
>Section E.24</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN114013"
>E.23.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix multiple bugs associated with <TT
CLASS="COMMAND"
>CREATE/DROP INDEX
CONCURRENTLY</TT
> (Andres Freund, Tom Lane, Simon Riggs, Pavan Deolasee)
</P
><P
> An error introduced while adding <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
>
allowed incorrect indexing decisions to be made during the initial
phase of <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
>; so that indexes built
by that command could be corrupt. It is recommended that indexes
built in 9.2.X with <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
> be rebuilt
after applying this update.
</P
><P
> In addition, fix <TT
CLASS="COMMAND"
>CREATE/DROP INDEX CONCURRENTLY</TT
> to use
in-place updates when changing the state of an index's
<TT
CLASS="STRUCTNAME"
>pg_index</TT
> row. This prevents race conditions that could
cause concurrent sessions to miss updating the target index, thus
again resulting in corrupt concurrently-created indexes.
</P
><P
> Also, fix various other operations to ensure that they ignore
invalid indexes resulting from a failed <TT
CLASS="COMMAND"
>CREATE INDEX
CONCURRENTLY</TT
> command. The most important of these is
<TT
CLASS="COMMAND"
>VACUUM</TT
>, because an auto-vacuum could easily be launched
on the table before corrective action can be taken to fix or remove
the invalid index.
</P
><P
> Also fix <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
> to not disable
insertions into the target index until all queries using it are done.
</P
><P
> Also fix misbehavior if <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
> is
canceled: the previous coding could leave an un-droppable index behind.
</P
></LI
><LI
><P
> Correct predicate locking for <TT
CLASS="COMMAND"
>DROP INDEX CONCURRENTLY</TT
>
(Kevin Grittner)
</P
><P
> Previously, SSI predicate locks were processed at the wrong time,
possibly leading to incorrect behavior of serializable transactions
executing in parallel with the <TT
CLASS="COMMAND"
>DROP</TT
>.
</P
></LI
><LI
><P
> Fix buffer locking during WAL replay (Tom Lane)
</P
><P
> The WAL replay code was insufficiently careful about locking buffers
when replaying WAL records that affect more than one page. This could
result in hot standby queries transiently seeing inconsistent states,
resulting in wrong answers or unexpected failures.
</P
></LI
><LI
><P
> Fix an error in WAL generation logic for GIN indexes (Tom Lane)
</P
><P
> This could result in index corruption, if a torn-page failure occurred.
</P
></LI
><LI
><P
> Fix an error in WAL replay logic for SP-GiST indexes (Tom Lane)
</P
><P
> This could result in index corruption after a crash, or on a standby
server.
</P
></LI
><LI
><P
> Fix incorrect detection of end-of-base-backup location during WAL
recovery (Heikki Linnakangas)
</P
><P
> This mistake allowed hot standby mode to start up before the database
reaches a consistent state.
</P
></LI
><LI
><P
> Properly remove startup process's virtual XID lock when promoting a
hot standby server to normal running (Simon Riggs)
</P
><P
> This oversight could prevent subsequent execution of certain
operations such as <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
>.
</P
></LI
><LI
><P
> Avoid bogus <SPAN
CLASS="QUOTE"
>"out-of-sequence timeline ID"</SPAN
> errors in standby
mode (Heikki Linnakangas)
</P
></LI
><LI
><P
> Prevent the postmaster from launching new child processes after it's
received a shutdown signal (Tom Lane)
</P
><P
> This mistake could result in shutdown taking longer than it should, or
even never completing at all without additional user action.
</P
></LI
><LI
><P
> Fix the syslogger process to not fail when
<TT
CLASS="VARNAME"
>log_rotation_age</TT
> exceeds 2^31 milliseconds (about 25 days)
(Tom Lane)
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>WaitLatch()</CODE
> to return promptly when the requested
timeout expires (Jeff Janes, Tom Lane)
</P
><P
> With the previous coding, a steady stream of non-wait-terminating
interrupts could delay return from <CODE
CLASS="FUNCTION"
>WaitLatch()</CODE
>
indefinitely. This has been shown to be a problem for the autovacuum
launcher process, and might cause trouble elsewhere as well.
</P
></LI
><LI
><P
> Avoid corruption of internal hash tables when out of memory
(Hitoshi Harada)
</P
></LI
><LI
><P
> Prevent file descriptors for dropped tables from being held open past
transaction end (Tom Lane)
</P
><P
> This should reduce problems with long-since-dropped tables continuing
to occupy disk space.
</P
></LI
><LI
><P
> Prevent database-wide crash and restart when a new child process is
unable to create a pipe for its latch (Tom Lane)
</P
><P
> Although the new process must fail, there is no good reason to force a
database-wide restart, so avoid that. This improves robustness when
the kernel is nearly out of file descriptors.
</P
></LI
><LI
><P
> Avoid planner crash with joins to unflattened subqueries (Tom Lane)
</P
></LI
><LI
><P
> Fix planning of non-strict equivalence clauses above outer joins
(Tom Lane)
</P
><P
> The planner could derive incorrect constraints from a clause equating
a non-strict construct to something else, for example
<TT
CLASS="LITERAL"
>WHERE COALESCE(foo, 0) = 0</TT
>
when <TT
CLASS="LITERAL"
>foo</TT
> is coming from the nullable side of an outer join.
9.2 showed this type of error in more cases than previous releases,
but the basic bug has been there for a long time.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>SELECT DISTINCT</TT
> with index-optimized
<CODE
CLASS="FUNCTION"
>MIN</CODE
>/<CODE
CLASS="FUNCTION"
>MAX</CODE
> on an inheritance tree (Tom Lane)
</P
><P
> The planner would fail with <SPAN
CLASS="QUOTE"
>"failed to re-find MinMaxAggInfo
record"</SPAN
> given this combination of factors.
</P
></LI
><LI
><P
> Make sure the planner sees implicit and explicit casts as equivalent
for all purposes, except in the minority of cases where there's
actually a semantic difference (Tom Lane)
</P
></LI
><LI
><P
> Include join clauses when considering whether partial indexes can be
used for a query (Tom Lane)
</P
><P
> A strict join clause can be sufficient to establish an
<TT
CLASS="REPLACEABLE"
><I
>x</I
></TT
> <TT
CLASS="LITERAL"
>IS NOT NULL</TT
> predicate, for example.
This fixes a planner regression in 9.2, since previous versions could
make comparable deductions.
</P
></LI
><LI
><P
> Limit growth of planning time when there are many indexable join
clauses for the same index (Tom Lane)
</P
></LI
><LI
><P
> Improve planner's ability to prove exclusion constraints from
equivalence classes (Tom Lane)
</P
></LI
><LI
><P
> Fix partial-row matching in hashed subplans to handle cross-type cases
correctly (Tom Lane)
</P
><P
> This affects multicolumn <TT
CLASS="LITERAL"
>NOT IN</TT
> subplans, such as
<TT
CLASS="LITERAL"
>WHERE (a, b) NOT IN (SELECT x, y FROM ...)</TT
>
when for instance <TT
CLASS="LITERAL"
>b</TT
> and <TT
CLASS="LITERAL"
>y</TT
> are <TT
CLASS="TYPE"
>int4</TT
>
and <TT
CLASS="TYPE"
>int8</TT
> respectively. This mistake led to wrong answers
or crashes depending on the specific datatypes involved.
</P
></LI
><LI
><P
> Fix btree mark/restore functions to handle array keys (Tom Lane)
</P
><P
> This oversight could result in wrong answers from merge joins whose
inner side is an index scan using an
<TT
CLASS="LITERAL"
><TT
CLASS="REPLACEABLE"
><I
>indexed_column</I
></TT
> =
ANY(<TT
CLASS="REPLACEABLE"
><I
>array</I
></TT
>)</TT
> condition.
</P
></LI
><LI
><P
> Revert patch for taking fewer snapshots (Tom Lane)
</P
><P
> The 9.2 change to reduce the number of snapshots taken during query
execution led to some anomalous behaviors not seen in previous
releases, because execution would proceed with a snapshot acquired
before locking the tables used by the query. Thus, for example,
a query would not be guaranteed to see updates committed by a
preceding transaction even if that transaction had exclusive lock.
We'll probably revisit this in future releases, but meanwhile put it
back the way it was before 9.2.
</P
></LI
><LI
><P
> Acquire buffer lock when re-fetching the old tuple for an
<TT
CLASS="LITERAL"
>AFTER ROW UPDATE/DELETE</TT
> trigger (Andres Freund)
</P
><P
> In very unusual circumstances, this oversight could result in passing
incorrect data to a trigger <TT
CLASS="LITERAL"
>WHEN</TT
> condition, or to the
precheck logic for a foreign-key enforcement trigger. That could
result in a crash, or in an incorrect decision about whether to
fire the trigger.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>ALTER COLUMN TYPE</TT
> to handle inherited check
constraints properly (Pavan Deolasee)
</P
><P
> This worked correctly in pre-8.4 releases, and now works correctly
in 8.4 and later.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>ALTER EXTENSION SET SCHEMA</TT
>'s failure to move some
subsidiary objects into the new schema (Álvaro Herrera, Dimitri
Fontaine)
</P
></LI
><LI
><P
> Handle <TT
CLASS="COMMAND"
>CREATE TABLE AS EXECUTE</TT
> correctly in extended query
protocol (Tom Lane)
</P
></LI
><LI
><P
> Don't modify the input parse tree in <TT
CLASS="COMMAND"
>DROP RULE IF NOT
EXISTS</TT
> and <TT
CLASS="COMMAND"
>DROP TRIGGER IF NOT EXISTS</TT
> (Tom Lane)
</P
><P
> This mistake would cause errors if a cached statement of one of these
types was re-executed.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>REASSIGN OWNED</TT
> to handle grants on tablespaces
(Álvaro Herrera)
</P
></LI
><LI
><P
> Ignore incorrect <TT
CLASS="STRUCTNAME"
>pg_attribute</TT
> entries for system
columns for views (Tom Lane)
</P
><P
> Views do not have any system columns. However, we forgot to
remove such entries when converting a table to a view. That's fixed
properly for 9.3 and later, but in previous branches we need to defend
against existing mis-converted views.
</P
></LI
><LI
><P
> Fix rule printing to dump <TT
CLASS="LITERAL"
>INSERT INTO <TT
CLASS="REPLACEABLE"
><I
>table</I
></TT
>
DEFAULT VALUES</TT
> correctly (Tom Lane)
</P
></LI
><LI
><P
> Guard against stack overflow when there are too many
<TT
CLASS="LITERAL"
>UNION</TT
>/<TT
CLASS="LITERAL"
>INTERSECT</TT
>/<TT
CLASS="LITERAL"
>EXCEPT</TT
> clauses
in a query (Tom Lane)
</P
></LI
><LI
><P
> Prevent platform-dependent failures when dividing the minimum possible
integer value by -1 (Xi Wang, Tom Lane)
</P
></LI
><LI
><P
> Fix possible access past end of string in date parsing
(Hitoshi Harada)
</P
></LI
><LI
><P
> Fix failure to advance XID epoch if XID wraparound happens during a
checkpoint and <TT
CLASS="VARNAME"
>wal_level</TT
> is <TT
CLASS="LITERAL"
>hot_standby</TT
>
(Tom Lane, Andres Freund)
</P
><P
> While this mistake had no particular impact on
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> itself, it was bad for
applications that rely on <CODE
CLASS="FUNCTION"
>txid_current()</CODE
> and related
functions: the TXID value would appear to go backwards.
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>pg_terminate_backend()</CODE
> and
<CODE
CLASS="FUNCTION"
>pg_cancel_backend()</CODE
> to not throw error for a non-existent
target process (Josh Kupershmidt)
</P
><P
> This case already worked as intended when called by a superuser,
but not so much when called by ordinary users.
</P
></LI
><LI
><P
> Fix display of
<TT
CLASS="STRUCTNAME"
>pg_stat_replication</TT
>.<TT
CLASS="STRUCTFIELD"
>sync_state</TT
> at a
page boundary (Kyotaro Horiguchi)
</P
></LI
><LI
><P
> Produce an understandable error message if the length of the path name
for a Unix-domain socket exceeds the platform-specific limit
(Tom Lane, Andrew Dunstan)
</P
><P
> Formerly, this would result in something quite unhelpful, such as
<SPAN
CLASS="QUOTE"
>"Non-recoverable failure in name resolution"</SPAN
>.
</P
></LI
><LI
><P
> Fix memory leaks when sending composite column values to the client
(Tom Lane)
</P
></LI
><LI
><P
> Save some cycles by not searching for subtransaction locks at commit
(Simon Riggs)
</P
><P
> In a transaction holding many exclusive locks, this useless activity
could be quite costly.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> more robust about reading the
<TT
CLASS="FILENAME"
>postmaster.pid</TT
> file (Heikki Linnakangas)
</P
><P
> This fixes race conditions and possible file descriptor leakage.
</P
></LI
><LI
><P
> Fix possible crash in <SPAN
CLASS="APPLICATION"
>psql</SPAN
> if incorrectly-encoded data
is presented and the <TT
CLASS="VARNAME"
>client_encoding</TT
> setting is a
client-only encoding, such as SJIS (Jiang Guiqing)
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> dump <TT
CLASS="LITERAL"
>SEQUENCE SET</TT
> items in
the data not pre-data section of the archive (Tom Lane)
</P
><P
> This fixes an undesirable inconsistency between the meanings of
<TT
CLASS="OPTION"
>--data-only</TT
> and <TT
CLASS="OPTION"
>--section=data</TT
>, and also fixes
dumping of sequences that are marked as extension configuration tables.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s handling of <TT
CLASS="COMMAND"
>DROP DATABASE</TT
>
commands in <TT
CLASS="OPTION"
>--clean</TT
> mode (Guillaume Lelarge)
</P
><P
> Beginning in 9.2.0, <TT
CLASS="LITERAL"
>pg_dump --clean</TT
> would issue a
<TT
CLASS="COMMAND"
>DROP DATABASE</TT
> command, which was either useless or
dangerous depending on the usage scenario. It no longer does that.
This change also fixes the combination of <TT
CLASS="OPTION"
>--clean</TT
> and
<TT
CLASS="OPTION"
>--create</TT
> to work sensibly, i.e., emit <TT
CLASS="COMMAND"
>DROP
DATABASE</TT
> then <TT
CLASS="COMMAND"
>CREATE DATABASE</TT
> before reconnecting to the
target database.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> for views with circular dependencies and
no relation options (Tom Lane)
</P
><P
> The previous fix to dump relation options when a view is
involved in a circular dependency didn't work right for the case
that the view has no options; it emitted <TT
CLASS="LITERAL"
>ALTER VIEW foo
SET ()</TT
> which is invalid syntax.
</P
></LI
><LI
><P
> Fix bugs in the <TT
CLASS="FILENAME"
>restore.sql</TT
> script emitted by
<SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> in <TT
CLASS="LITERAL"
>tar</TT
> output format (Tom Lane)
</P
><P
> The script would fail outright on tables whose names include
upper-case characters. Also, make the script capable of restoring
data in <TT
CLASS="OPTION"
>--inserts</TT
> mode as well as the regular COPY mode.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> to accept POSIX-conformant
<TT
CLASS="LITERAL"
>tar</TT
> files (Brian Weaver, Tom Lane)
</P
><P
> The original coding of <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s <TT
CLASS="LITERAL"
>tar</TT
>
output mode produced files that are not fully conformant with the
POSIX standard. This has been corrected for version 9.3. This
patch updates previous branches so that they will accept both the
incorrect and the corrected formats, in hopes of avoiding
compatibility problems when 9.3 comes out.
</P
></LI
><LI
><P
> Fix <TT
CLASS="LITERAL"
>tar</TT
> files emitted by <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> to
be POSIX conformant (Brian Weaver, Tom Lane)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_resetxlog</SPAN
> to locate <TT
CLASS="FILENAME"
>postmaster.pid</TT
>
correctly when given a relative path to the data directory (Tom Lane)
</P
><P
> This mistake could lead to <SPAN
CLASS="APPLICATION"
>pg_resetxlog</SPAN
> not noticing
that there is an active postmaster using the data directory.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s <CODE
CLASS="FUNCTION"
>lo_import()</CODE
> and
<CODE
CLASS="FUNCTION"
>lo_export()</CODE
> functions to report file I/O errors properly
(Tom Lane)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s processing of nested structure pointer
variables (Muhammad Usama)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s <CODE
CLASS="FUNCTION"
>ecpg_get_data</CODE
> function to
handle arrays properly (Michael Meskes)
</P
></LI
><LI
><P
> Prevent <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> from trying to process TOAST tables
for system catalogs (Bruce Momjian)
</P
><P
> This fixes an error seen when the <TT
CLASS="LITERAL"
>information_schema</TT
> has
been dropped and recreated. Other failures were also possible.
</P
></LI
><LI
><P
> Improve <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> performance by setting
<TT
CLASS="VARNAME"
>synchronous_commit</TT
> to <TT
CLASS="LITERAL"
>off</TT
> in the new cluster
(Bruce Momjian)
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>contrib/pageinspect</TT
>'s btree page inspection
functions take buffer locks while examining pages (Tom Lane)
</P
></LI
><LI
><P
> Work around unportable behavior of <TT
CLASS="LITERAL"
>malloc(0)</TT
> and
<TT
CLASS="LITERAL"
>realloc(NULL, 0)</TT
> (Tom Lane)
</P
><P
> On platforms where these calls return <TT
CLASS="LITERAL"
>NULL</TT
>, some code
mistakenly thought that meant out-of-memory.
This is known to have broken <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> for databases
containing no user-defined aggregates. There might be other cases
as well.
</P
></LI
><LI
><P
> Ensure that <TT
CLASS="LITERAL"
>make install</TT
> for an extension creates the
<TT
CLASS="FILENAME"
>extension</TT
> installation directory (Cédric Villemain)
</P
><P
> Previously, this step was missed if <TT
CLASS="VARNAME"
>MODULEDIR</TT
> was set in
the extension's Makefile.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pgxs</SPAN
> support for building loadable modules on AIX
(Tom Lane)
</P
><P
> Building modules outside the original source tree didn't work on AIX.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2012j
for DST law changes in Cuba, Israel, Jordan, Libya, Palestine, Western
Samoa, and portions of Brazil.
</P
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