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>E.207. Release 7.4.20</A
></H1
><DIV
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><P
><B
>Release date: </B
>never released</P
></DIV
><P
>   This release contains a variety of fixes from 7.4.19.
   For information about new features in the 7.4 major release, see
   <A
HREF="release-7-4.html"
>Section E.227</A
>.
  </P
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><A
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>E.207.1. Migration to Version 7.4.20</A
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><P
>    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
>.
   </P
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>E.207.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Fix conversions between ISO-8859-5 and other encodings to handle
      Cyrillic <SPAN
CLASS="QUOTE"
>"Yo"</SPAN
> characters (<TT
CLASS="LITERAL"
>e</TT
> and <TT
CLASS="LITERAL"
>E</TT
> with
      two dots) (Sergey Burladyan)
     </P
></LI
><LI
><P
>      Fix a few datatype input functions
      that were allowing unused bytes in their results to contain
      uninitialized, unpredictable values (Tom)
     </P
><P
>      This could lead to failures in which two apparently identical literal
      values were not seen as equal, resulting in the parser complaining
      about unmatched <TT
CLASS="LITERAL"
>ORDER BY</TT
> and <TT
CLASS="LITERAL"
>DISTINCT</TT
>
      expressions.
     </P
></LI
><LI
><P
>      Fix a corner case in regular-expression substring matching
      (<TT
CLASS="LITERAL"
>substring(<TT
CLASS="REPLACEABLE"
><I
>string</I
></TT
> from
      <TT
CLASS="REPLACEABLE"
><I
>pattern</I
></TT
>)</TT
>) (Tom)
     </P
><P
>      The problem occurs when there is a match to the pattern overall but
      the user has specified a parenthesized subexpression and that
      subexpression hasn't got a match.  An example is
      <TT
CLASS="LITERAL"
>substring('foo' from 'foo(bar)?')</TT
>.
      This should return NULL, since <TT
CLASS="LITERAL"
>(bar)</TT
> isn't matched, but
      it was mistakenly returning the whole-pattern match instead (ie,
      <TT
CLASS="LITERAL"
>foo</TT
>).
     </P
></LI
><LI
><P
>      Fix incorrect result from <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
>'s
      <CODE
CLASS="FUNCTION"
>PGTYPEStimestamp_sub()</CODE
> function (Michael)
     </P
></LI
><LI
><P
>      Fix <TT
CLASS="LITERAL"
>DatumGetBool</TT
> macro to not fail with <SPAN
CLASS="APPLICATION"
>gcc</SPAN
>
      4.3 (Tom)
     </P
><P
>      This problem affects <SPAN
CLASS="QUOTE"
>"old style"</SPAN
> (V0) C functions that
      return boolean.  The fix is already in 8.3, but the need to
      back-patch it was not realized at the time.
     </P
></LI
><LI
><P
>      Fix longstanding <TT
CLASS="COMMAND"
>LISTEN</TT
>/<TT
CLASS="COMMAND"
>NOTIFY</TT
>
      race condition (Tom)
     </P
><P
>      In rare cases a session that had just executed a
      <TT
CLASS="COMMAND"
>LISTEN</TT
> might not get a notification, even though
      one would be expected because the concurrent transaction executing
      <TT
CLASS="COMMAND"
>NOTIFY</TT
> was observed to commit later.
     </P
><P
>      A side effect of the fix is that a transaction that has executed
      a not-yet-committed <TT
CLASS="COMMAND"
>LISTEN</TT
> command will not see any
      row in <TT
CLASS="STRUCTNAME"
>pg_listener</TT
> for the <TT
CLASS="COMMAND"
>LISTEN</TT
>,
      should it choose to look; formerly it would have.  This behavior
      was never documented one way or the other, but it is possible that
      some applications depend on the old behavior.
     </P
></LI
><LI
><P
>      Fix display of constant expressions in <TT
CLASS="LITERAL"
>ORDER BY</TT
>
      and <TT
CLASS="LITERAL"
>GROUP BY</TT
> (Tom)
     </P
><P
>      An explicitly casted constant would be shown incorrectly.  This could
      for example lead to corruption of a view definition during
      dump and reload.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> to handle NOTICE messages correctly
      during COPY OUT (Tom)
     </P
><P
>      This failure has only been observed to occur when a user-defined
      datatype's output routine issues a NOTICE, but there is no
      guarantee it couldn't happen due to other causes.
     </P
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