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><A
NAME="RELEASE-9-2-20"
>E.5. Release 9.2.20</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2017-02-09</P
></DIV
><P
> This release contains a variety of fixes from 9.2.19.
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="AEN111249"
>E.5.1. Migration to Version 9.2.20</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, if your installation has been affected by the bug described in
the first changelog entry below, then after updating you may need
to take action to repair corrupted indexes.
</P
><P
> Also, if you are upgrading from a version earlier than 9.2.11,
see <A
HREF="release-9-2-11.html"
>Section E.14</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN111255"
>E.5.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix a race condition that could cause indexes built
with <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
> to be corrupt
(Pavan Deolasee, Tom Lane)
</P
><P
> If <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
> was used to build an index
that depends on a column not previously indexed, then rows
updated by transactions that ran concurrently with
the <TT
CLASS="COMMAND"
>CREATE INDEX</TT
> command could have received incorrect
index entries. If you suspect this may have happened, the most
reliable solution is to rebuild affected indexes after installing
this update.
</P
></LI
><LI
><P
> Unconditionally WAL-log creation of the <SPAN
CLASS="QUOTE"
>"init fork"</SPAN
> for an
unlogged table (Michael Paquier)
</P
><P
> Previously, this was skipped when <A
HREF="runtime-config-wal.html#GUC-WAL-LEVEL"
>wal_level</A
>
= <TT
CLASS="LITERAL"
>minimal</TT
>, but actually it's necessary even in that case
to ensure that the unlogged table is properly reset to empty after a
crash.
</P
></LI
><LI
><P
> Fix WAL page header validation when re-reading segments (Takayuki
Tsunakawa, Amit Kapila)
</P
><P
> In corner cases, a spurious <SPAN
CLASS="QUOTE"
>"out-of-sequence TLI"</SPAN
> error
could be reported during recovery.
</P
></LI
><LI
><P
> If the stats collector dies during hot standby, restart it (Takayuki
Tsunakawa)
</P
></LI
><LI
><P
> Check for interrupts while hot standby is waiting for a conflicting
query (Simon Riggs)
</P
></LI
><LI
><P
> Avoid constantly respawning the autovacuum launcher in a corner case
(Amit Khandekar)
</P
><P
> This fix avoids problems when autovacuum is nominally off and there
are some tables that require freezing, but all such tables are
already being processed by autovacuum workers.
</P
></LI
><LI
><P
> Fix check for when an extension member object can be dropped (Tom Lane)
</P
><P
> Extension upgrade scripts should be able to drop member objects,
but this was disallowed for serial-column sequences, and possibly
other cases.
</P
></LI
><LI
><P
> Make sure <TT
CLASS="COMMAND"
>ALTER TABLE</TT
> preserves index tablespace
assignments when rebuilding indexes (Tom Lane, Michael Paquier)
</P
><P
> Previously, non-default settings
of <A
HREF="runtime-config-client.html#GUC-DEFAULT-TABLESPACE"
>default_tablespace</A
> could result in broken
indexes.
</P
></LI
><LI
><P
> Prevent dropping a foreign-key constraint if there are pending
trigger events for the referenced relation (Tom Lane)
</P
><P
> This avoids <SPAN
CLASS="QUOTE"
>"could not find trigger <TT
CLASS="REPLACEABLE"
><I
>NNN</I
></TT
>"</SPAN
>
or <SPAN
CLASS="QUOTE"
>"relation <TT
CLASS="REPLACEABLE"
><I
>NNN</I
></TT
> has no triggers"</SPAN
> errors.
</P
></LI
><LI
><P
> Fix processing of OID column when a table with OIDs is associated to
a parent with OIDs via <TT
CLASS="COMMAND"
>ALTER TABLE ... INHERIT</TT
> (Amit
Langote)
</P
><P
> The OID column should be treated the same as regular user columns in
this case, but it wasn't, leading to odd behavior in later
inheritance changes.
</P
></LI
><LI
><P
> Check for serializability conflicts before reporting
constraint-violation failures (Thomas Munro)
</P
><P
> When using serializable transaction isolation, it is desirable
that any error due to concurrent transactions should manifest
as a serialization failure, thereby cueing the application that
a retry might succeed. Unfortunately, this does not reliably
happen for duplicate-key failures caused by concurrent insertions.
This change ensures that such an error will be reported as a
serialization error if the application explicitly checked for
the presence of a conflicting key (and did not find it) earlier
in the transaction.
</P
></LI
><LI
><P
> Ensure that column typmods are determined accurately for
multi-row <TT
CLASS="LITERAL"
>VALUES</TT
> constructs (Tom Lane)
</P
><P
> This fixes problems occurring when the first value in a column has a
determinable typmod (e.g., length for a <TT
CLASS="TYPE"
>varchar</TT
> value) but
later values don't share the same limit.
</P
></LI
><LI
><P
> Throw error for an unfinished Unicode surrogate pair at the end of a
Unicode string (Tom Lane)
</P
><P
> Normally, a Unicode surrogate leading character must be followed by a
Unicode surrogate trailing character, but the check for this was
missed if the leading character was the last character in a Unicode
string literal (<TT
CLASS="LITERAL"
>U&'...'</TT
>) or Unicode identifier
(<TT
CLASS="LITERAL"
>U&"..."</TT
>).
</P
></LI
><LI
><P
> Ensure that a purely negative text search query, such
as <TT
CLASS="LITERAL"
>!foo</TT
>, matches empty <TT
CLASS="TYPE"
>tsvector</TT
>s (Tom Dunstan)
</P
><P
> Such matches were found by GIN index searches, but not by sequential
scans or GiST index searches.
</P
></LI
><LI
><P
> Prevent crash when <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
> replaces a non-top-level
subtree with an empty query (Artur Zakirov)
</P
></LI
><LI
><P
> Fix performance problems in <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
> (Tom Lane)
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
>'s handling of nested NOT operators
(Tom Lane)
</P
></LI
><LI
><P
> Fix <CODE
CLASS="FUNCTION"
>array_fill()</CODE
> to handle empty arrays properly (Tom Lane)
</P
></LI
><LI
><P
> Fix one-byte buffer overrun in <CODE
CLASS="FUNCTION"
>quote_literal_cstr()</CODE
>
(Heikki Linnakangas)
</P
><P
> The overrun occurred only if the input consisted entirely of single
quotes and/or backslashes.
</P
></LI
><LI
><P
> Prevent multiple calls of <CODE
CLASS="FUNCTION"
>pg_start_backup()</CODE
>
and <CODE
CLASS="FUNCTION"
>pg_stop_backup()</CODE
> from running concurrently (Michael
Paquier)
</P
><P
> This avoids an assertion failure, and possibly worse things, if
someone tries to run these functions in parallel.
</P
></LI
><LI
><P
> Avoid discarding <TT
CLASS="TYPE"
>interval</TT
>-to-<TT
CLASS="TYPE"
>interval</TT
> casts
that aren't really no-ops (Tom Lane)
</P
><P
> In some cases, a cast that should result in zeroing out
low-order <TT
CLASS="TYPE"
>interval</TT
> fields was mistakenly deemed to be a
no-op and discarded. An example is that casting from <TT
CLASS="TYPE"
>INTERVAL
MONTH</TT
> to <TT
CLASS="TYPE"
>INTERVAL YEAR</TT
> failed to clear the months field.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to dump user-defined casts and transforms
that use built-in functions (Stephen Frost)
</P
></LI
><LI
><P
> Fix possible <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> failure on standby
server when including WAL files (Amit Kapila, Robert Haas)
</P
></LI
><LI
><P
> Ensure that the Python exception objects we create for PL/Python are
properly reference-counted (Rafa de la Torre, Tom Lane)
</P
><P
> This avoids failures if the objects are used after a Python garbage
collection cycle has occurred.
</P
></LI
><LI
><P
> Fix PL/Tcl to support triggers on tables that have <TT
CLASS="LITERAL"
>.tupno</TT
>
as a column name (Tom Lane)
</P
><P
> This matches the (previously undocumented) behavior of
PL/Tcl's <TT
CLASS="COMMAND"
>spi_exec</TT
> and <TT
CLASS="COMMAND"
>spi_execp</TT
> commands,
namely that a magic <TT
CLASS="LITERAL"
>.tupno</TT
> column is inserted only if
there isn't a real column named that.
</P
></LI
><LI
><P
> Allow DOS-style line endings in <TT
CLASS="FILENAME"
>~/.pgpass</TT
> files,
even on Unix (Vik Fearing)
</P
><P
> This change simplifies use of the same password file across Unix and
Windows machines.
</P
></LI
><LI
><P
> Fix one-byte buffer overrun if <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> is given a file
name that ends with a dot (Takayuki Tsunakawa)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion for <TT
CLASS="COMMAND"
>ALTER DEFAULT
PRIVILEGES</TT
> (Gilles Darold, Stephen Frost)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>psql</SPAN
>, treat an empty or all-blank setting of
the <TT
CLASS="ENVAR"
>PAGER</TT
> environment variable as meaning <SPAN
CLASS="QUOTE"
>"no
pager"</SPAN
> (Tom Lane)
</P
><P
> Previously, such a setting caused output intended for the pager to
vanish entirely.
</P
></LI
><LI
><P
> Improve <TT
CLASS="FILENAME"
>contrib/dblink</TT
>'s reporting of
low-level <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> errors, such as out-of-memory
(Joe Conway)
</P
></LI
><LI
><P
> On Windows, ensure that environment variable changes are propagated
to DLLs built with debug options (Christian Ullrich)
</P
></LI
><LI
><P
> Sync our copy of the timezone library with IANA release tzcode2016j
(Tom Lane)
</P
><P
> This fixes various issues, most notably that timezone data
installation failed if the target directory didn't support hard
links.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2016j
for DST law changes in northern Cyprus (adding a new zone
Asia/Famagusta), Russia (adding a new zone Europe/Saratov), Tonga,
and Antarctica/Casey.
Historical corrections for Italy, Kazakhstan, Malta, and Palestine.
Switch to preferring numeric zone abbreviations for Tonga.
</P
></LI
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