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><A
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>E.6. Release 9.2.19</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2016-10-27</P
></DIV
><P
> This release contains a variety of fixes from 9.2.18.
For information about new features in the 9.2 major release, see
<A
HREF="release-9-2.html"
>Section E.25</A
>.
</P
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN111399"
>E.6.1. Migration to Version 9.2.19</A
></H2
><P
> A dump/restore is not required for those running 9.2.X.
</P
><P
> However, 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
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><H2
CLASS="SECT2"
><A
NAME="AEN111404"
>E.6.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix EvalPlanQual rechecks involving CTE scans (Tom Lane)
</P
><P
> The recheck would always see the CTE as returning no rows, typically
leading to failure to update rows that were recently updated.
</P
></LI
><LI
><P
> Fix improper repetition of previous results from hashed aggregation in
a subquery (Andrew Gierth)
</P
><P
> The test to see if we can reuse a previously-computed hash table of
the aggregate state values neglected the possibility of an outer query
reference appearing in an aggregate argument expression. A change in
the value of such a reference should lead to recalculating the hash
table, but did not.
</P
></LI
><LI
><P
> Fix <TT
CLASS="COMMAND"
>EXPLAIN</TT
> to emit valid XML when
<A
HREF="runtime-config-statistics.html#GUC-TRACK-IO-TIMING"
>track_io_timing</A
> is on (Markus Winand)
</P
><P
> Previously the XML output-format option produced syntactically invalid
tags such as <TT
CLASS="LITERAL"
><I/O-Read-Time></TT
>. That is now
rendered as <TT
CLASS="LITERAL"
><I-O-Read-Time></TT
>.
</P
></LI
><LI
><P
> Suppress printing of zeroes for unmeasured times
in <TT
CLASS="COMMAND"
>EXPLAIN</TT
> (Maksim Milyutin)
</P
><P
> Certain option combinations resulted in printing zero values for times
that actually aren't ever measured in that combination. Our general
policy in <TT
CLASS="COMMAND"
>EXPLAIN</TT
> is not to print such fields at all, so
do that consistently in all cases.
</P
></LI
><LI
><P
> Fix timeout length when <TT
CLASS="COMMAND"
>VACUUM</TT
> is waiting for exclusive
table lock so that it can truncate the table (Simon Riggs)
</P
><P
> The timeout was meant to be 50 milliseconds, but it was actually only
50 microseconds, causing <TT
CLASS="COMMAND"
>VACUUM</TT
> to give up on truncation
much more easily than intended. Set it to the intended value.
</P
></LI
><LI
><P
> Fix bugs in merging inherited <TT
CLASS="LITERAL"
>CHECK</TT
> constraints while
creating or altering a table (Tom Lane, Amit Langote)
</P
><P
> Allow identical <TT
CLASS="LITERAL"
>CHECK</TT
> constraints to be added to a parent
and child table in either order. Prevent merging of a valid
constraint from the parent table with a <TT
CLASS="LITERAL"
>NOT VALID</TT
>
constraint on the child. Likewise, prevent merging of a <TT
CLASS="LITERAL"
>NO
INHERIT</TT
> child constraint with an inherited constraint.
</P
></LI
><LI
><P
> Remove artificial restrictions on the values accepted
by <CODE
CLASS="FUNCTION"
>numeric_in()</CODE
> and <CODE
CLASS="FUNCTION"
>numeric_recv()</CODE
>
(Tom Lane)
</P
><P
> We allow numeric values up to the limit of the storage format (more
than <TT
CLASS="LITERAL"
>1e100000</TT
>), so it seems fairly pointless
that <CODE
CLASS="FUNCTION"
>numeric_in()</CODE
> rejected scientific-notation exponents
above 1000. Likewise, it was silly for <CODE
CLASS="FUNCTION"
>numeric_recv()</CODE
> to
reject more than 1000 digits in an input value.
</P
></LI
><LI
><P
> Avoid very-low-probability data corruption due to testing tuple
visibility without holding buffer lock (Thomas Munro, Peter Geoghegan,
Tom Lane)
</P
></LI
><LI
><P
> Fix file descriptor leakage when truncating a temporary relation of
more than 1GB (Andres Freund)
</P
></LI
><LI
><P
> Disallow starting a standalone backend with <TT
CLASS="LITERAL"
>standby_mode</TT
>
turned on (Michael Paquier)
</P
><P
> This can't do anything useful, since there will be no WAL receiver
process to fetch more WAL data; and it could result in misbehavior
in code that wasn't designed with this situation in mind.
</P
></LI
><LI
><P
> Don't try to share SSL contexts across multiple connections
in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> (Heikki Linnakangas)
</P
><P
> This led to assorted corner-case bugs, particularly when trying to use
different SSL parameters for different connections.
</P
></LI
><LI
><P
> Avoid corner-case memory leak in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> (Tom Lane)
</P
><P
> The reported problem involved leaking an error report
during <CODE
CLASS="FUNCTION"
>PQreset()</CODE
>, but there might be related cases.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s <TT
CLASS="OPTION"
>--help</TT
> and <TT
CLASS="OPTION"
>--version</TT
>
options work consistently with our other executables (Haribabu Kommi)
</P
></LI
><LI
><P
> In <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>, never dump range constructor functions
(Tom Lane)
</P
><P
> This oversight led to <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> failures with
extensions containing range types, due to duplicate creation of the
constructor functions.
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/intarray/bench/bench.pl</TT
> to print the results
of the <TT
CLASS="COMMAND"
>EXPLAIN</TT
> it does when given the <TT
CLASS="OPTION"
>-e</TT
> option
(Daniel Gustafsson)
</P
></LI
><LI
><P
> Update Windows time zone mapping to recognize some time zone names
added in recent Windows versions (Michael Paquier)
</P
></LI
><LI
><P
> Prevent failure of obsolete dynamic time zone abbreviations (Tom Lane)
</P
><P
> If a dynamic time zone abbreviation does not match any entry in the
referenced time zone, treat it as equivalent to the time zone name.
This avoids unexpected failures when IANA removes abbreviations from
their time zone database, as they did in <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
>
release 2016f and seem likely to do again in the future. The
consequences were not limited to not recognizing the individual
abbreviation; any mismatch caused
the <TT
CLASS="STRUCTNAME"
>pg_timezone_abbrevs</TT
> view to fail altogether.
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2016h
for DST law changes in Palestine and Turkey, plus historical
corrections for Turkey and some regions of Russia.
Switch to numeric abbreviations for some time zones in Antarctica,
the former Soviet Union, and Sri Lanka.
</P
><P
> The IANA time zone database previously provided textual abbreviations
for all time zones, sometimes making up abbreviations that have little
or no currency among the local population. They are in process of
reversing that policy in favor of using numeric UTC offsets in zones
where there is no evidence of real-world use of an English
abbreviation. At least for the time being, <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
will continue to accept such removed abbreviations for timestamp input.
But they will not be shown in the <TT
CLASS="STRUCTNAME"
>pg_timezone_names</TT
>
view nor used for output.
</P
><P
> In this update, <TT
CLASS="LITERAL"
>AMT</TT
> is no longer shown as being in use to
mean Armenia Time. Therefore, we have changed the <TT
CLASS="LITERAL"
>Default</TT
>
abbreviation set to interpret it as Amazon Time, thus UTC-4 not UTC+4.
</P
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