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>E.178. Release 8.0.18</A
></H1
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><P
><B
>Release date: </B
>2008-09-22</P
></DIV
><P
>   This release contains a variety of fixes from 8.0.17.
   For information about new features in the 8.0 major release, see
   <A
HREF="release-8-0.html"
>Section E.196</A
>.
  </P
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><A
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>E.178.1. Migration to Version 8.0.18</A
></H2
><P
>    A dump/restore is not required for those running 8.0.X.
    However, if you are upgrading from a version earlier than 8.0.6,
    see <A
HREF="release-8-0-6.html"
>Section E.190</A
>.
   </P
></DIV
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><H2
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><A
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>E.178.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Widen local lock counters from 32 to 64 bits (Tom)
     </P
><P
>      This responds to reports that the counters could overflow in
      sufficiently long transactions, leading to unexpected <SPAN
CLASS="QUOTE"
>"lock is
      already held"</SPAN
> errors.
     </P
></LI
><LI
><P
>      Add checks in executor startup to ensure that the tuples produced by an
      <TT
CLASS="COMMAND"
>INSERT</TT
> or <TT
CLASS="COMMAND"
>UPDATE</TT
> will match the target table's
      current rowtype (Tom)
     </P
><P
>      <TT
CLASS="COMMAND"
>ALTER COLUMN TYPE</TT
>, followed by re-use of a previously
      cached plan, could produce this type of situation.  The check protects
      against data corruption and/or crashes that could ensue.
     </P
></LI
><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
><LI
><P
>      Fix bug in backwards scanning of a cursor on a <TT
CLASS="LITERAL"
>SELECT DISTINCT
      ON</TT
> query (Tom)
     </P
></LI
><LI
><P
>      Fix planner to estimate that <TT
CLASS="LITERAL"
>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
CLASS="REPLACEABLE"
><I
>col</I
></TT
>
      <TT
CLASS="LITERAL"
>IS NULL</TT
>.
     </P
></LI
><LI
><P
>      Fix PL/Tcl to behave correctly with Tcl 8.5, and to be more careful
      about the encoding of data sent to or from Tcl (Tom)
     </P
></LI
><LI
><P
>      Fix PL/Python to work with Python 2.5
     </P
><P
>      This is a back-port of fixes made during the 8.2 development cycle.
     </P
></LI
><LI
><P
>      Improve <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> and <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s
      error reporting after failure to send a SQL command (Tom)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> to properly preserve postmaster
      command-line arguments across a <TT
CLASS="LITERAL"
>restart</TT
> (Bruce)
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2008f (for
      DST law changes in Argentina, Bahamas, Brazil, Mauritius, Morocco,
      Pakistan, Palestine, and Paraguay)
     </P
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