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></H1
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><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
>.
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>E.207.1. Migration to Version 7.4.20</A
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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.207.2. Changes</A
></H2
><P
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><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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