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><A
NAME="RELEASE-9-0-6"
>E.68. Release 9.0.6</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-12-05</P
></DIV
><P
> This release contains a variety of fixes from 9.0.5.
For information about new features in the 9.0 major release, see
<A
HREF="release-9-0.html"
>Section E.74</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122535"
>E.68.1. Migration to Version 9.0.6</A
></H2
><P
> A dump/restore is not required for those running 9.0.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 are upgrading from a version earlier than 9.0.4,
see <A
HREF="release-9-0-4.html"
>Section E.70</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN122542"
>E.68.2. 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
> 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
> 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
> 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
> 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
> 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
> 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
> 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
> 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
> 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 Mac OS X start script
(Sidar Lopez)
</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
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