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>Appendix E. Release Notes</TD
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>E.146. Release 8.1.23</A
></H1
><DIV
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><P
><B
>Release date: </B
>2010-12-16</P
></DIV
><P
>   This release contains a variety of fixes from 8.1.22.
   For information about new features in the 8.1 major release, see
   <A
HREF="release-8-1.html"
>Section E.169</A
>.
  </P
><P
>   This is expected to be the last <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> release
   in the 8.1.X series.  Users are encouraged to update to a newer
   release branch soon.
  </P
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><A
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>E.146.1. Migration to Version 8.1.23</A
></H2
><P
>    A dump/restore is not required for those running 8.1.X.
    However, if you are upgrading from a version earlier than 8.1.18,
    see <A
HREF="release-8-1-18.html"
>Section E.151</A
>.
   </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN135448"
>E.146.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Force the default
      <A
HREF="runtime-config-wal.html#GUC-WAL-SYNC-METHOD"
><TT
CLASS="VARNAME"
>wal_sync_method</TT
></A
>
      to be <TT
CLASS="LITERAL"
>fdatasync</TT
> on Linux (Tom Lane, Marti Raudsepp)
     </P
><P
>      The default on Linux has actually been <TT
CLASS="LITERAL"
>fdatasync</TT
> for many
      years, but recent kernel changes caused <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> to
      choose <TT
CLASS="LITERAL"
>open_datasync</TT
> instead.  This choice did not result
      in any performance improvement, and caused outright failures on
      certain filesystems, notably <TT
CLASS="LITERAL"
>ext4</TT
> with the
      <TT
CLASS="LITERAL"
>data=journal</TT
> mount option.
     </P
></LI
><LI
><P
>      Fix recovery from base backup when the starting checkpoint WAL record
      is not in the same WAL segment as its redo point (Jeff Davis)
     </P
></LI
><LI
><P
>      Add support for detecting register-stack overrun on <TT
CLASS="LITERAL"
>IA64</TT
>
      (Tom Lane)
     </P
><P
>      The <TT
CLASS="LITERAL"
>IA64</TT
> architecture has two hardware stacks.  Full
      prevention of stack-overrun failures requires checking both.
     </P
></LI
><LI
><P
>      Add a check for stack overflow in <CODE
CLASS="FUNCTION"
>copyObject()</CODE
> (Tom Lane)
     </P
><P
>      Certain code paths could crash due to stack overflow given a
      sufficiently complex query.
     </P
></LI
><LI
><P
>      Fix detection of page splits in temporary GiST indexes (Heikki
      Linnakangas)
     </P
><P
>      It is possible to have a <SPAN
CLASS="QUOTE"
>"concurrent"</SPAN
> page split in a
      temporary index, if for example there is an open cursor scanning the
      index when an insertion is done.  GiST failed to detect this case and
      hence could deliver wrong results when execution of the cursor
      continued.
     </P
></LI
><LI
><P
>      Avoid memory leakage while <TT
CLASS="COMMAND"
>ANALYZE</TT
>'ing complex index
      expressions (Tom Lane)
     </P
></LI
><LI
><P
>      Ensure an index that uses a whole-row Var still depends on its table
      (Tom Lane)
     </P
><P
>      An index declared like <TT
CLASS="LITERAL"
>create index i on t (foo(t.*))</TT
>
      would not automatically get dropped when its table was dropped.
     </P
></LI
><LI
><P
>      Do not <SPAN
CLASS="QUOTE"
>"inline"</SPAN
> a SQL function with multiple <TT
CLASS="LITERAL"
>OUT</TT
>
      parameters (Tom Lane)
     </P
><P
>      This avoids a possible crash due to loss of information about the
      expected result rowtype.
     </P
></LI
><LI
><P
>      Fix constant-folding of <TT
CLASS="LITERAL"
>COALESCE()</TT
> expressions (Tom Lane)
     </P
><P
>      The planner would sometimes attempt to evaluate sub-expressions that
      in fact could never be reached, possibly leading to unexpected errors.
     </P
></LI
><LI
><P
>      Add print functionality for <TT
CLASS="STRUCTNAME"
>InhRelation</TT
> nodes (Tom Lane)
     </P
><P
>      This avoids a failure when <TT
CLASS="VARNAME"
>debug_print_parse</TT
> is enabled
      and certain types of query are executed.
     </P
></LI
><LI
><P
>      Fix incorrect calculation of distance from a point to a horizontal
      line segment (Tom Lane)
     </P
><P
>      This bug affected several different geometric distance-measurement
      operators.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>PL/pgSQL</SPAN
>'s handling of <SPAN
CLASS="QUOTE"
>"simple"</SPAN
>
      expressions to not fail in recursion or error-recovery cases (Tom Lane)
     </P
></LI
><LI
><P
>      Fix bug in <TT
CLASS="FILENAME"
>contrib/cube</TT
>'s GiST picksplit algorithm
      (Alexander Korotkov)
     </P
><P
>      This could result in considerable inefficiency, though not actually
      incorrect answers, in a GiST index on a <TT
CLASS="TYPE"
>cube</TT
> column.
      If you have such an index, consider <TT
CLASS="COMMAND"
>REINDEX</TT
>ing it after
      installing this update.
     </P
></LI
><LI
><P
>      Don't emit <SPAN
CLASS="QUOTE"
>"identifier will be truncated"</SPAN
> notices in
      <TT
CLASS="FILENAME"
>contrib/dblink</TT
> except when creating new connections
      (Itagaki Takahiro)
     </P
></LI
><LI
><P
>      Fix potential coredump on missing public key in
      <TT
CLASS="FILENAME"
>contrib/pgcrypto</TT
> (Marti Raudsepp)
     </P
></LI
><LI
><P
>      Fix memory leak in <TT
CLASS="FILENAME"
>contrib/xml2</TT
>'s XPath query functions
      (Tom Lane)
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2010o
      for DST law changes in Fiji and Samoa;
      also historical corrections for Hong Kong.
     </P
></LI
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