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><P
><B
>Release date: </B
>2016-03-31</P
></DIV
><P
> This release contains a variety of fixes from 9.1.20.
For information about new features in the 9.1 major release, see
<A
HREF="release-9-1.html"
>Section E.50</A
>.
</P
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>E.29.1. Migration to Version 9.1.21</A
></H2
><P
> A dump/restore is not required for those running 9.1.X.
</P
><P
> However, if you are upgrading from a version earlier than 9.1.16,
see <A
HREF="release-9-1-16.html"
>Section E.34</A
>.
</P
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><H2
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><A
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>E.29.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix incorrect handling of NULL index entries in
indexed <TT
CLASS="LITERAL"
>ROW()</TT
> comparisons (Tom Lane)
</P
><P
> An index search using a row comparison such as <TT
CLASS="LITERAL"
>ROW(a, b) >
ROW('x', 'y')</TT
> would stop upon reaching a NULL entry in
the <TT
CLASS="STRUCTFIELD"
>b</TT
> column, ignoring the fact that there might be
non-NULL <TT
CLASS="STRUCTFIELD"
>b</TT
> values associated with later values
of <TT
CLASS="STRUCTFIELD"
>a</TT
>.
</P
></LI
><LI
><P
> Avoid unlikely data-loss scenarios due to renaming files without
adequate <CODE
CLASS="FUNCTION"
>fsync()</CODE
> calls before and after (Michael Paquier,
Tomas Vondra, Andres Freund)
</P
></LI
><LI
><P
> Correctly handle cases where <TT
CLASS="LITERAL"
>pg_subtrans</TT
> is close to XID
wraparound during server startup (Jeff Janes)
</P
></LI
><LI
><P
> Fix corner-case crash due to trying to free <CODE
CLASS="FUNCTION"
>localeconv()</CODE
>
output strings more than once (Tom Lane)
</P
></LI
><LI
><P
> Fix parsing of affix files for <TT
CLASS="LITERAL"
>ispell</TT
> dictionaries
(Tom Lane)
</P
><P
> The code could go wrong if the affix file contained any characters
whose byte length changes during case-folding, for
example <TT
CLASS="LITERAL"
>I</TT
> in Turkish UTF8 locales.
</P
></LI
><LI
><P
> Avoid use of <CODE
CLASS="FUNCTION"
>sscanf()</CODE
> to parse <TT
CLASS="LITERAL"
>ispell</TT
>
dictionary files (Artur Zakirov)
</P
><P
> This dodges a portability problem on FreeBSD-derived platforms
(including macOS).
</P
></LI
><LI
><P
> Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an
AVX2-capable CPU and a Postgres build done with Visual Studio 2013
(Christian Ullrich)
</P
><P
> This is a workaround for a bug in Visual Studio 2013's runtime
library, which Microsoft have stated they will not fix in that
version.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion logic to handle multibyte
characters properly (Kyotaro Horiguchi, Robert Haas)
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion for
<TT
CLASS="LITERAL"
>SECURITY LABEL</TT
> (Tom Lane)
</P
><P
> Pressing TAB after <TT
CLASS="LITERAL"
>SECURITY LABEL</TT
> might cause a crash
or offering of inappropriate keywords.
</P
></LI
><LI
><P
> Make <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> accept a wait timeout from the
<TT
CLASS="ENVAR"
>PGCTLTIMEOUT</TT
> environment variable, if none is specified on
the command line (Noah Misch)
</P
><P
> This eases testing of slower buildfarm members by allowing them
to globally specify a longer-than-normal timeout for postmaster
startup and shutdown.
</P
></LI
><LI
><P
> Fix incorrect test for Windows service status
in <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> (Manuel Mathar)
</P
><P
> The previous set of minor releases attempted to
fix <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> to properly determine whether to send log
messages to Window's Event Log, but got the test backwards.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pgbench</SPAN
> to correctly handle the combination
of <TT
CLASS="LITERAL"
>-C</TT
> and <TT
CLASS="LITERAL"
>-M prepared</TT
> options (Tom Lane)
</P
></LI
><LI
><P
> In PL/Perl, properly translate empty Postgres arrays into empty Perl
arrays (Alex Hunsaker)
</P
></LI
><LI
><P
> Make PL/Python cope with function names that aren't valid Python
identifiers (Jim Nasby)
</P
></LI
><LI
><P
> Fix multiple mistakes in the statistics returned
by <TT
CLASS="FILENAME"
>contrib/pgstattuple</TT
>'s <CODE
CLASS="FUNCTION"
>pgstatindex()</CODE
>
function (Tom Lane)
</P
></LI
><LI
><P
> Remove dependency on <TT
CLASS="LITERAL"
>psed</TT
> in MSVC builds, since it's no
longer provided by core Perl (Michael Paquier, Andrew Dunstan)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2016c
for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia
(Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus
historical corrections for Lithuania, Moldova, and Russia
(Kaliningrad, Samara, Volgograd).
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