Release date: 2011-12-05
This release contains a variety of fixes from 9.1.1. For information about new features in the 9.1 major release, see Section E.128.
A dump/restore is not required for those running 9.1.X.
However, a longstanding error was discovered in the
definition of the
view. If you rely on correct results from that view, you should
replace its definition as explained in the first changelog item
Also, if you use the
type, and you upgraded from a previous major release by running
pg_upgrade, you should run
CREATE EXTENSION citext FROM
unpackaged to avoid collation-related failures in
citext operations. The same is
necessary if you restore a dump from a pre-9.1 database that
contains an instance of the
data type. If you've already run the
CREATE EXTENSION command before upgrading to
9.1.2, you will instead need to do manual catalog updates as
explained in the second changelog item.
Fix bugs in
view (Tom Lane)
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.
Since the view definition is installed by initdb, merely upgrading will not
fix the problem. If you need to fix this in an existing
installation, you can (as a superuser) drop the
then re-create it by sourcing
pg_config --sharedir if
you're uncertain where
SHAREDIR is.) This must
be repeated in each database to be fixed.
upgrade script fix collations of
citext columns and indexes (Tom Lane)
citext columns and
indexes aren't correctly marked as being of a collatable
data type during pg_upgrade from a pre-9.1 server, or
when a pre-9.1 dump containing the
citext type is loaded into a 9.1 server.
That leads to operations on these columns failing with
errors such as “could not determine which collation to use for
string comparison”. This change allows them
to be fixed by the same script that upgrades the
citext module into a proper 9.1
citext FROM unpackaged.
If you have a previously-upgraded database that is
suffering from this problem, and you already ran the
CREATE EXTENSION command,
you can manually run (as superuser) the
UPDATE commands found at the end of
pg_config --sharedir if
you're uncertain where
SHAREDIR is.) There is no
harm in doing this again if unsure.
Fix possible crash during
DELETE that joins to the output of a
scalar-returning function (Tom Lane)
A crash could only occur if the target row had been concurrently updated, so this problem surfaced only intermittently.
Fix incorrect replay of WAL records for GIN index updates (Tom Lane)
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
VACUUM of the index, however.
Fix TOAST-related data corruption during
CREATE TABLE dest AS SELECT * FROM src
INSERT INTO dest SELECT * FROM
src (Tom Lane)
If a table has been modified by
ALTER TABLE ADD COLUMN, 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.
Fix possible failures during hot standby startup (Simon Riggs)
Start hot standby faster when initial snapshot is incomplete (Simon Riggs)
Fix race condition during toast table access from stale syscache entries (Tom Lane)
The typical symptom was transient errors like “missing chunk number 0 for toast value NNNNN in pg_toast_2619”, where the cited toast table would always belong to a system catalog.
Track dependencies of functions on items used in parameter default expressions (Tom Lane)
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
CREATE OR REPLACE each such
function afterwards. If you have functions whose defaults
depend on non-built-in objects, doing so is
Fix incorrect management of placeholder variables in nestloop joins (Tom Lane)
This bug is known to lead to “variable not found in subplan target list” planner errors, and could possibly result in wrong query output when outer joins are involved.
Fix window functions that sort by expressions involving aggregates (Tom Lane)
Previously these could fail with “could not find pathkey item to sort” planner errors.
Fix “MergeAppend child's targetlist doesn't match MergeAppend” planner errors (Tom Lane)
Fix index matching for operators with both collatable and noncollatable inputs (Tom Lane)
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
Allow inlining of set-returning SQL functions with multiple OUT parameters (Tom Lane)
Don't trust deferred-unique indexes for join removal (Tom Lane and Marti Raudsepp)
A deferred uniqueness constraint might not hold intra-transaction, so assuming that it does could give incorrect query results.
unpack inet datums that have a 1-byte header, and add a
DatumGetInetPP(), that does not (Heikki
This change affects no core code, but might prevent
crashes in add-on code that expects
DatumGetInetP() to produce an unpacked
datum as per usual convention.
Improve locale support in
money type's input and output (Tom
Aside from not supporting all standard
lc_monetary formatting options, the
input and output functions were inconsistent, meaning
there were locales in which dumped
money values could not be re-read.
CASE foo WHEN NULL
... constructs (Heikki Linnakangas)
only supposed to affect
NULL expressions written directly by the user, not
equality checks generated internally by this form of
Change foreign-key trigger creation order to better support self-referential foreign keys (Tom Lane)
For a cascading foreign key that references its own
table, a row update will fire both the
ON UPDATE trigger and the
CHECK trigger as one event. The
ON UPDATE trigger must
execute first, else the
CHECK 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 “RI_ConstraintTrigger_NNNN”. 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.
IF EXISTS to work
FAMILY (Robert Haas)
Disallow dropping of an extension from within its own script (Tom Lane)
This prevents odd behavior in case of incorrect management of extension dependencies.
Don't mark auto-generated types as extension members (Robert Haas)
Relation rowtypes and automatically-generated array
types do not need to have their own extension membership
creating such entries complicates matters for extension
Cope with invalid pre-existing
search_path settings during
CREATE EXTENSION (Tom Lane)
Avoid floating-point underflow while tracking buffer allocation rate (Greg Matthews)
While harmless in itself, on certain platforms this would result in annoying kernel log messages.
Prevent autovacuum transactions from running in serializable mode (Tom Lane)
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.
Ensure walsender processes respond promptly to SIGTERM (Magnus Hagander)
from base backups (Magnus Hagander)
Preserve configuration file name and line number values when starting child processes under Windows (Tom Lane)
Formerly, these would not be displayed correctly in
Fix incorrect field alignment in ecpg's SQLDA area (Zoltan Boszormenyi)
Preserve blank lines within commands in psql's command history (Robert Haas)
The former behavior could cause problems if an empty line was removed from within a string literal, for example.
Avoid platform-specific infinite loop in pg_dump (Steve Singer)
Fix compression of plain-text output format in pg_dump (Adrian Klaver and Tom Lane)
-F switch to mean
that it should emit a gzip-compressed version of its
plain text output. Restore that behavior.
Fix pg_dump to dump user-defined casts between auto-generated types, such as table rowtypes (Tom Lane)
Fix missed quoting of foreign server names in pg_dump (Tom Lane)
Assorted fixes for pg_upgrade (Bruce Momjian)
Handle exclusion constraints correctly, avoid failures on Windows, don't complain about mismatched toast table names in 8.4 databases.
In PL/pgSQL, allow foreign tables to define row types (Alexander Soudakov)
Fix up conversions of PL/Perl functions' results (Alex Hunsaker and Tom Lane)
Restore the pre-9.1 behavior that PL/Perl functions
void 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
HASH(0x221aa90) in such cases.)
Ensure PL/Perl strings are always correctly UTF8-encoded (Amit Khandekar and Alex Hunsaker)
Use the preferred version of xsubpp to build PL/Perl, not necessarily the operating system's main copy (David Wheeler and Alex Hunsaker)
Correctly propagate SQLSTATE in PL/Python exceptions (Mika Eloranta and Jan Urbanski)
Do not install PL/Python extension files for Python major versions other than the one built against (Peter Eisentraut)
Change all the
extension script files to report a useful error message
if they are fed to psql
(Andrew Dunstan and Tom Lane)
This should help teach people about the new method of
CREATE EXTENSION to
load these files. In most cases, sourcing the scripts
directly would fail anyway, but with harder-to-interpret
Fix incorrect coding in
contrib/dict_xsyn (Tom Lane)
Some functions incorrectly assumed that memory
tests from the regular regression test mechanism (Tom
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.
Fix assorted errors in
contrib/unaccent's configuration file
parsing (Tom Lane)
Honor query cancel interrupts promptly in
pgstatindex() (Robert Haas)
Fix incorrect quoting of log file name in macOS start script (Sidar Lopez)
Revert unintentional enabling of
WAL_DEBUG (Robert Haas)
Fortunately, as debugging tools go, this one is pretty cheap; but it's not intended to be enabled by default, so revert.
Ensure VPATH builds properly install all server header files (Peter Eisentraut)
Shorten file names reported in verbose error messages (Peter Eisentraut)
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.
Fix interpretation of Windows timezone names for Central America (Tom Lane)
America Standard Time” to
CST6CDT, because DST is generally not
observed anywhere in Central America.
Update time zone data files to tzdata release 2011n for DST law changes in Brazil, Cuba, Fiji, Palestine, Russia, and Samoa; also historical corrections for Alaska and British East Africa.