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><A
NAME="RELEASE-9-1-2"
>E.48. Release 9.1.2</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-12-05</P
></DIV
><P
> This release contains a variety of fixes from 9.1.1.
For information about new features in the 9.1 major release, see
<A
HREF="release-9-1.html"
>Section E.50</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118806"
>E.48.1. Migration to Version 9.1.2</A
></H2
><P
> A dump/restore is not required for those running 9.1.X.
</P
><P
> However, a longstanding error was discovered in the definition of the
<TT
CLASS="LITERAL"
>information_schema.referential_constraints</TT
> view. If you
rely on correct results from that view, you should replace its
definition as explained in the first changelog item below.
</P
><P
> Also, if you use the <TT
CLASS="TYPE"
>citext</TT
> data type, and you upgraded
from a previous major release by running <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
>,
you should run <TT
CLASS="LITERAL"
>CREATE EXTENSION citext FROM unpackaged</TT
>
to avoid collation-related failures in <TT
CLASS="TYPE"
>citext</TT
> operations.
The same is necessary if you restore a dump from a pre-9.1 database
that contains an instance of the <TT
CLASS="TYPE"
>citext</TT
> data type.
If you've already run the <TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> command before
upgrading to 9.1.2, you will instead need to do manual catalog updates
as explained in the second changelog item.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN118818"
>E.48.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix bugs in <TT
CLASS="LITERAL"
>information_schema.referential_constraints</TT
> view
(Tom Lane)
</P
><P
> This view was being insufficiently careful about matching the
foreign-key constraint to the depended-on primary or unique key
constraint. That could result in failure to show a foreign key
constraint at all, or showing it multiple times, or claiming that it
depends on a different constraint than the one it really does.
</P
><P
> Since the view definition is installed by <SPAN
CLASS="APPLICATION"
>initdb</SPAN
>,
merely upgrading will not fix the problem. If you need to fix this
in an existing installation, you can (as a superuser) drop the
<TT
CLASS="LITERAL"
>information_schema</TT
> schema then re-create it by sourcing
<TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>SHAREDIR</I
></TT
>/information_schema.sql</TT
>.
(Run <TT
CLASS="LITERAL"
>pg_config --sharedir</TT
> if you're uncertain where
<TT
CLASS="REPLACEABLE"
><I
>SHAREDIR</I
></TT
> is.) This must be repeated in each database
to be fixed.
</P
></LI
><LI
><P
> Make <TT
CLASS="FILENAME"
>contrib/citext</TT
>'s upgrade script fix collations of
<TT
CLASS="TYPE"
>citext</TT
> columns and indexes (Tom Lane)
</P
><P
> Existing <TT
CLASS="TYPE"
>citext</TT
> columns and indexes aren't correctly marked as
being of a collatable data type during <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> from
a pre-9.1 server, or when a pre-9.1 dump containing the <TT
CLASS="TYPE"
>citext</TT
>
type is loaded into a 9.1 server.
That leads to operations on these columns failing with errors
such as <SPAN
CLASS="QUOTE"
>"could not determine which collation to use for string
comparison"</SPAN
>. This change allows them to be fixed by the same
script that upgrades the <TT
CLASS="TYPE"
>citext</TT
> module into a proper 9.1
extension during <TT
CLASS="LITERAL"
>CREATE EXTENSION citext FROM unpackaged</TT
>.
</P
><P
> If you have a previously-upgraded database that is suffering from this
problem, and you already ran the <TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> command,
you can manually run (as superuser) the <TT
CLASS="COMMAND"
>UPDATE</TT
> commands
found at the end of
<TT
CLASS="FILENAME"
><TT
CLASS="REPLACEABLE"
><I
>SHAREDIR</I
></TT
>/extension/citext--unpackaged--1.0.sql</TT
>.
(Run <TT
CLASS="LITERAL"
>pg_config --sharedir</TT
> if you're uncertain where
<TT
CLASS="REPLACEABLE"
><I
>SHAREDIR</I
></TT
> is.)
There is no harm in doing this again if unsure.
</P
></LI
><LI
><P
> Fix possible crash during <TT
CLASS="COMMAND"
>UPDATE</TT
> or <TT
CLASS="COMMAND"
>DELETE</TT
> that
joins to the output of a scalar-returning function (Tom Lane)
</P
><P
> A crash could only occur if the target row had been concurrently
updated, so this problem surfaced only intermittently.
</P
></LI
><LI
><P
> Fix incorrect replay of WAL records for GIN index updates
(Tom Lane)
</P
><P
> This could result in transiently failing to find index entries after
a crash, or on a hot-standby server. The problem would be repaired
by the next <TT
CLASS="COMMAND"
>VACUUM</TT
> of the index, however.
</P
></LI
><LI
><P
> Fix TOAST-related data corruption during <TT
CLASS="LITERAL"
>CREATE TABLE dest AS
SELECT * FROM src</TT
> or <TT
CLASS="LITERAL"
>INSERT INTO dest SELECT * FROM src</TT
>
(Tom Lane)
</P
><P
> If a table has been modified by <TT
CLASS="COMMAND"
>ALTER TABLE ADD COLUMN</TT
>,
attempts to copy its data verbatim to another table could produce
corrupt results in certain corner cases.
The problem can only manifest in this precise form in 8.4 and later,
but we patched earlier versions as well in case there are other code
paths that could trigger the same bug.
</P
></LI
><LI
><P
> Fix possible failures during hot standby startup (Simon Riggs)
</P
></LI
><LI
><P
> Start hot standby faster when initial snapshot is incomplete
(Simon Riggs)
</P
></LI
><LI
><P
> Fix race condition during toast table access from stale syscache entries
(Tom Lane)
</P
><P
> The typical symptom was transient errors like <SPAN
CLASS="QUOTE"
>"missing chunk
number 0 for toast value NNNNN in pg_toast_2619"</SPAN
>, where the cited
toast table would always belong to a system catalog.
</P
></LI
><LI
><P
> Track dependencies of functions on items used in parameter default
expressions (Tom Lane)
</P
><P
> Previously, a referenced object could be dropped without having dropped
or modified the function, leading to misbehavior when the function was
used. Note that merely installing this update will not fix the missing
dependency entries; to do that, you'd need to <TT
CLASS="COMMAND"
>CREATE OR
REPLACE</TT
> each such function afterwards. If you have functions whose
defaults depend on non-built-in objects, doing so is recommended.
</P
></LI
><LI
><P
> Fix incorrect management of placeholder variables in nestloop joins
(Tom Lane)
</P
><P
> This bug is known to lead to <SPAN
CLASS="QUOTE"
>"variable not found in subplan target
list"</SPAN
> planner errors, and could possibly result in wrong query output
when outer joins are involved.
</P
></LI
><LI
><P
> Fix window functions that sort by expressions involving aggregates
(Tom Lane)
</P
><P
> Previously these could fail with <SPAN
CLASS="QUOTE"
>"could not find pathkey item to
sort"</SPAN
> planner errors.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="QUOTE"
>"MergeAppend child's targetlist doesn't match MergeAppend"</SPAN
>
planner errors (Tom Lane)
</P
></LI
><LI
><P
> Fix index matching for operators with both collatable and noncollatable
inputs (Tom Lane)
</P
><P
> In 9.1.0, an indexable operator that has a non-collatable left-hand
input type and a collatable right-hand input type would not be
recognized as matching the left-hand column's index. An example is
the <TT
CLASS="TYPE"
>hstore</TT
> <TT
CLASS="LITERAL"
>?</TT
> <TT
CLASS="TYPE"
>text</TT
> operator.
</P
></LI
><LI
><P
> Allow inlining of set-returning SQL functions with multiple OUT
parameters (Tom Lane)
</P
></LI
><LI
><P
> Don't trust deferred-unique indexes for join removal (Tom Lane and Marti
Raudsepp)
</P
><P
> A deferred uniqueness constraint might not hold intra-transaction,
so assuming that it does could give incorrect query results.
</P
></LI
><LI
><P
> Make <CODE
CLASS="FUNCTION"
>DatumGetInetP()</CODE
> unpack inet datums that have a 1-byte
header, and add a new macro, <CODE
CLASS="FUNCTION"
>DatumGetInetPP()</CODE
>, that does
not (Heikki Linnakangas)
</P
><P
> This change affects no core code, but might prevent crashes in add-on
code that expects <CODE
CLASS="FUNCTION"
>DatumGetInetP()</CODE
> to produce an unpacked
datum as per usual convention.
</P
></LI
><LI
><P
> Improve locale support in <TT
CLASS="TYPE"
>money</TT
> type's input and output
(Tom Lane)
</P
><P
> Aside from not supporting all standard
<A
HREF="runtime-config-client.html#GUC-LC-MONETARY"
><TT
CLASS="VARNAME"
>lc_monetary</TT
></A
>
formatting options, the input and output functions were inconsistent,
meaning there were locales in which dumped <TT
CLASS="TYPE"
>money</TT
> values could
not be re-read.
</P
></LI
><LI
><P
> Don't let <A
HREF="runtime-config-compatible.html#GUC-TRANSFORM-NULL-EQUALS"
><TT
CLASS="VARNAME"
>transform_null_equals</TT
></A
>
affect <TT
CLASS="LITERAL"
>CASE foo WHEN NULL ...</TT
> constructs
(Heikki Linnakangas)
</P
><P
> <TT
CLASS="VARNAME"
>transform_null_equals</TT
> is only supposed to affect
<TT
CLASS="LITERAL"
>foo = NULL</TT
> expressions written directly by the user, not
equality checks generated internally by this form of <TT
CLASS="LITERAL"
>CASE</TT
>.
</P
></LI
><LI
><P
> Change foreign-key trigger creation order to better support
self-referential foreign keys (Tom Lane)
</P
><P
> For a cascading foreign key that references its own table, a row update
will fire both the <TT
CLASS="LITERAL"
>ON UPDATE</TT
> trigger and the
<TT
CLASS="LITERAL"
>CHECK</TT
> trigger as one event. The <TT
CLASS="LITERAL"
>ON UPDATE</TT
>
trigger must execute first, else the <TT
CLASS="LITERAL"
>CHECK</TT
> will check a
non-final state of the row and possibly throw an inappropriate error.
However, the firing order of these triggers is determined by their
names, which generally sort in creation order since the triggers have
auto-generated names following the convention
<SPAN
CLASS="QUOTE"
>"RI_ConstraintTrigger_NNNN"</SPAN
>. A proper fix would require
modifying that convention, which we will do in 9.2, but it seems risky
to change it in existing releases. So this patch just changes the
creation order of the triggers. Users encountering this type of error
should drop and re-create the foreign key constraint to get its
triggers into the right order.
</P
></LI
><LI
><P
> Fix <TT
CLASS="LITERAL"
>IF EXISTS</TT
> to work correctly in <TT
CLASS="COMMAND"
>DROP OPERATOR
FAMILY</TT
> (Robert Haas)
</P
></LI
><LI
><P
> Disallow dropping of an extension from within its own script
(Tom Lane)
</P
><P
> This prevents odd behavior in case of incorrect management of extension
dependencies.
</P
></LI
><LI
><P
> Don't mark auto-generated types as extension members (Robert Haas)
</P
><P
> Relation rowtypes and automatically-generated array types do not need to
have their own extension membership entries in <TT
CLASS="STRUCTNAME"
>pg_depend</TT
>,
and creating such entries complicates matters for extension upgrades.
</P
></LI
><LI
><P
> Cope with invalid pre-existing <TT
CLASS="VARNAME"
>search_path</TT
> settings during
<TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> (Tom Lane)
</P
></LI
><LI
><P
> Avoid floating-point underflow while tracking buffer allocation rate
(Greg Matthews)
</P
><P
> While harmless in itself, on certain platforms this would result in
annoying kernel log messages.
</P
></LI
><LI
><P
> Prevent autovacuum transactions from running in serializable mode
(Tom Lane)
</P
><P
> Autovacuum formerly used the cluster-wide default transaction isolation
level, but there is no need for it to use anything higher than READ
COMMITTED, and using SERIALIZABLE could result in unnecessary delays
for other processes.
</P
></LI
><LI
><P
> Ensure walsender processes respond promptly to <SPAN
CLASS="SYSTEMITEM"
>SIGTERM</SPAN
>
(Magnus Hagander)
</P
></LI
><LI
><P
> Exclude <TT
CLASS="FILENAME"
>postmaster.opts</TT
> from base backups
(Magnus Hagander)
</P
></LI
><LI
><P
> Preserve configuration file name and line number values when starting
child processes under Windows (Tom Lane)
</P
><P
> Formerly, these would not be displayed correctly in the
<TT
CLASS="STRUCTNAME"
>pg_settings</TT
> view.
</P
></LI
><LI
><P
> Fix incorrect field alignment in <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s SQLDA area
(Zoltan Boszormenyi)
</P
></LI
><LI
><P
> Preserve blank lines within commands in <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s command
history (Robert Haas)
</P
><P
> The former behavior could cause problems if an empty line was removed
from within a string literal, for example.
</P
></LI
><LI
><P
> Avoid platform-specific infinite loop in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
(Steve Singer)
</P
></LI
><LI
><P
> Fix compression of plain-text output format in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
(Adrian Klaver and Tom Lane)
</P
><P
> <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> has historically understood <TT
CLASS="LITERAL"
>-Z</TT
> with
no <TT
CLASS="LITERAL"
>-F</TT
> switch to mean that it should emit a gzip-compressed
version of its plain text output. Restore that behavior.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to dump user-defined casts between
auto-generated types, such as table rowtypes (Tom Lane)
</P
></LI
><LI
><P
> Fix missed quoting of foreign server names in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>
(Tom Lane)
</P
></LI
><LI
><P
> Assorted fixes for <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> (Bruce Momjian)
</P
><P
> Handle exclusion constraints correctly, avoid failures on Windows,
don't complain about mismatched toast table names in 8.4 databases.
</P
></LI
><LI
><P
> In PL/pgSQL, allow foreign tables to define row types
(Alexander Soudakov)
</P
></LI
><LI
><P
> Fix up conversions of PL/Perl functions' results
(Alex Hunsaker and Tom Lane)
</P
><P
> Restore the pre-9.1 behavior that PL/Perl functions returning
<TT
CLASS="TYPE"
>void</TT
> ignore the result value of their last Perl statement;
9.1.0 would throw an error if that statement returned a reference.
Also, make sure it works to return a string value for a composite type,
so long as the string meets the type's input format.
In addition, throw errors for attempts to return Perl arrays or hashes
when the function's declared result type is not an array or composite
type, respectively. (Pre-9.1 versions rather uselessly returned
strings like <TT
CLASS="LITERAL"
>ARRAY(0x221a9a0)</TT
> or
<TT
CLASS="LITERAL"
>HASH(0x221aa90)</TT
> in such cases.)
</P
></LI
><LI
><P
> Ensure PL/Perl strings are always correctly UTF8-encoded
(Amit Khandekar and Alex Hunsaker)
</P
></LI
><LI
><P
> Use the preferred version of <SPAN
CLASS="APPLICATION"
>xsubpp</SPAN
> to build PL/Perl,
not necessarily the operating system's main copy
(David Wheeler and Alex Hunsaker)
</P
></LI
><LI
><P
> Correctly propagate SQLSTATE in PL/Python exceptions
(Mika Eloranta and Jan Urbanski)
</P
></LI
><LI
><P
> Do not install PL/Python extension files for Python major versions
other than the one built against (Peter Eisentraut)
</P
></LI
><LI
><P
> Change all the <TT
CLASS="FILENAME"
>contrib</TT
> extension script files to report
a useful error message if they are fed to <SPAN
CLASS="APPLICATION"
>psql</SPAN
>
(Andrew Dunstan and Tom Lane)
</P
><P
> This should help teach people about the new method of using
<TT
CLASS="COMMAND"
>CREATE EXTENSION</TT
> to load these files. In most cases,
sourcing the scripts directly would fail anyway, but with
harder-to-interpret messages.
</P
></LI
><LI
><P
> Fix incorrect coding in <TT
CLASS="FILENAME"
>contrib/dict_int</TT
> and
<TT
CLASS="FILENAME"
>contrib/dict_xsyn</TT
> (Tom Lane)
</P
><P
> Some functions incorrectly assumed that memory returned by
<CODE
CLASS="FUNCTION"
>palloc()</CODE
> is guaranteed zeroed.
</P
></LI
><LI
><P
> Remove <TT
CLASS="FILENAME"
>contrib/sepgsql</TT
> tests from the regular regression
test mechanism (Tom Lane)
</P
><P
> Since these tests require root privileges for setup, they're impractical
to run automatically. Switch over to a manual approach instead, and
provide a testing script to help with that.
</P
></LI
><LI
><P
> Fix assorted errors in <TT
CLASS="FILENAME"
>contrib/unaccent</TT
>'s configuration
file parsing (Tom Lane)
</P
></LI
><LI
><P
> Honor query cancel interrupts promptly in <CODE
CLASS="FUNCTION"
>pgstatindex()</CODE
>
(Robert Haas)
</P
></LI
><LI
><P
> Fix incorrect quoting of log file name in macOS start script
(Sidar Lopez)
</P
></LI
><LI
><P
> Revert unintentional enabling of <TT
CLASS="LITERAL"
>WAL_DEBUG</TT
> (Robert Haas)
</P
><P
> Fortunately, as debugging tools go, this one is pretty cheap;
but it's not intended to be enabled by default, so revert.
</P
></LI
><LI
><P
> Ensure VPATH builds properly install all server header files
(Peter Eisentraut)
</P
></LI
><LI
><P
> Shorten file names reported in verbose error messages (Peter Eisentraut)
</P
><P
> Regular builds have always reported just the name of the C file
containing the error message call, but VPATH builds formerly
reported an absolute path name.
</P
></LI
><LI
><P
> Fix interpretation of Windows timezone names for Central America
(Tom Lane)
</P
><P
> Map <SPAN
CLASS="QUOTE"
>"Central America Standard Time"</SPAN
> to <TT
CLASS="LITERAL"
>CST6</TT
>, not
<TT
CLASS="LITERAL"
>CST6CDT</TT
>, because DST is generally not observed anywhere in
Central America.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2011n
for DST law changes in Brazil, Cuba, Fiji, Palestine, Russia, and Samoa;
also historical corrections for Alaska and British East Africa.
</P
></LI
></UL
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