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>Appendix E. Release Notes</TD
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NAME="RELEASE-8-4-7"
>E.90. Release 8.4.7</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-01-31</P
></DIV
><P
>   This release contains a variety of fixes from 8.4.6.
   For information about new features in the 8.4 major release, see
   <A
HREF="release-8-4.html"
>Section E.97</A
>.
  </P
><DIV
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><H2
CLASS="SECT2"
><A
NAME="AEN126446"
>E.90.1. Migration to Version 8.4.7</A
></H2
><P
>    A dump/restore is not required for those running 8.4.X.
    However, if you are upgrading from a version earlier than 8.4.2,
    see <A
HREF="release-8-4-2.html"
>Section E.95</A
>.
   </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN126450"
>E.90.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Avoid failures when <TT
CLASS="COMMAND"
>EXPLAIN</TT
> tries to display a simple-form
      <TT
CLASS="LITERAL"
>CASE</TT
> expression (Tom Lane)
     </P
><P
>      If the <TT
CLASS="LITERAL"
>CASE</TT
>'s test expression was a constant, the planner
      could simplify the <TT
CLASS="LITERAL"
>CASE</TT
> into a form that confused the
      expression-display code, resulting in <SPAN
CLASS="QUOTE"
>"unexpected CASE WHEN
      clause"</SPAN
> errors.
     </P
></LI
><LI
><P
>      Fix assignment to an array slice that is before the existing range
      of subscripts (Tom Lane)
     </P
><P
>      If there was a gap between the newly added subscripts and the first
      pre-existing subscript, the code miscalculated how many entries needed
      to be copied from the old array's null bitmap, potentially leading to
      data corruption or crash.
     </P
></LI
><LI
><P
>      Avoid unexpected conversion overflow in planner for very distant date
      values (Tom Lane)
     </P
><P
>      The <TT
CLASS="TYPE"
>date</TT
> type supports a wider range of dates than can be
      represented by the <TT
CLASS="TYPE"
>timestamp</TT
> types, but the planner assumed it
      could always convert a date to timestamp with impunity.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s text output for large objects (BLOBs)
      when <TT
CLASS="VARNAME"
>standard_conforming_strings</TT
> is on (Tom Lane)
     </P
><P
>      Although restoring directly to a database worked correctly, string
      escaping was incorrect if <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> was asked for
      SQL text output and <TT
CLASS="VARNAME"
>standard_conforming_strings</TT
> had been
      enabled in the source database.
     </P
></LI
><LI
><P
>      Fix erroneous parsing of <TT
CLASS="TYPE"
>tsquery</TT
> values containing
      <TT
CLASS="LITERAL"
>... &amp; !(subexpression) | ...</TT
> (Tom Lane)
     </P
><P
>      Queries containing this combination of operators were not executed
      correctly.  The same error existed in <TT
CLASS="FILENAME"
>contrib/intarray</TT
>'s
      <TT
CLASS="TYPE"
>query_int</TT
> type and <TT
CLASS="FILENAME"
>contrib/ltree</TT
>'s
      <TT
CLASS="TYPE"
>ltxtquery</TT
> type.
     </P
></LI
><LI
><P
>      Fix buffer overrun in <TT
CLASS="FILENAME"
>contrib/intarray</TT
>'s input function
      for the <TT
CLASS="TYPE"
>query_int</TT
> type (Apple)
     </P
><P
>      This bug is a security risk since the function's return address could
      be overwritten.  Thanks to Apple Inc's security team for reporting this
      issue and supplying the fix.  (CVE-2010-4015)
     </P
></LI
><LI
><P
>      Fix bug in <TT
CLASS="FILENAME"
>contrib/seg</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"
>seg</TT
> column.
      If you have such an index, consider <TT
CLASS="COMMAND"
>REINDEX</TT
>ing it after
      installing this update.  (This is identical to the bug that was fixed in
      <TT
CLASS="FILENAME"
>contrib/cube</TT
> in the previous update.)
     </P
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