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><B
>Release date: </B
>2008-09-22</P
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><P
> This release contains a variety of fixes from 7.4.21.
For information about new features in the 7.4 major release, see
<A
HREF="release-7-4.html"
>Section E.227</A
>.
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>E.205.1. Migration to Version 7.4.22</A
></H2
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> A dump/restore is not required for those running 7.4.X.
However, if you are upgrading from a version earlier than 7.4.11,
see <A
HREF="release-7-4-11.html"
>Section E.216</A
>.
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>E.205.2. Changes</A
></H2
><P
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><UL
><LI
><P
> Fix datetime input functions to correctly detect integer overflow when
running on a 64-bit platform (Tom)
</P
></LI
><LI
><P
> Improve performance of writing very long log messages to syslog (Tom)
</P
></LI
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><P
> Fix bug in backwards scanning of a cursor on a <TT
CLASS="LITERAL"
>SELECT DISTINCT
ON</TT
> query (Tom)
</P
></LI
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><P
> Fix planner to estimate that <TT
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>GROUP BY</TT
> expressions yielding
boolean results always result in two groups, regardless of the
expressions' contents (Tom)
</P
><P
> This is very substantially more accurate than the regular <TT
CLASS="LITERAL"
>GROUP
BY</TT
> estimate for certain boolean tests like <TT
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><I
>col</I
></TT
>
<TT
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>IS NULL</TT
>.
</P
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><LI
><P
> Improve <SPAN
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>pg_dump</SPAN
> and <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s
error reporting after failure to send a SQL command (Tom)
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