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>Appendix E. Release Notes</TD
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>E.96. Release 8.4.1</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2009-09-09</P
></DIV
><P
> This release contains a variety of fixes from 8.4.
For information about new features in the 8.4 major release, see
<A
HREF="release-8-4.html"
>Section E.97</A
>.
</P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN127330"
>E.96.1. Migration to Version 8.4.1</A
></H2
><P
> A dump/restore is not required for those running 8.4.X.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN127333"
>E.96.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Fix WAL page header initialization at the end of archive recovery
(Heikki)
</P
><P
> This could lead to failure to process the WAL in a subsequent
archive recovery.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="QUOTE"
>"cannot make new WAL entries during recovery"</SPAN
> error (Tom)
</P
></LI
><LI
><P
> Fix problem that could make expired rows visible after a crash (Tom)
</P
><P
> This bug involved a page status bit potentially not being set
correctly after a server crash.
</P
></LI
><LI
><P
> Disallow <TT
CLASS="COMMAND"
>RESET ROLE</TT
> and <TT
CLASS="COMMAND"
>RESET SESSION
AUTHORIZATION</TT
> inside security-definer functions (Tom, Heikki)
</P
><P
> This covers a case that was missed in the previous patch that
disallowed <TT
CLASS="COMMAND"
>SET ROLE</TT
> and <TT
CLASS="COMMAND"
>SET SESSION
AUTHORIZATION</TT
> inside security-definer functions.
(See CVE-2007-6600)
</P
></LI
><LI
><P
> Make <TT
CLASS="COMMAND"
>LOAD</TT
> of an already-loaded loadable module
into a no-op (Tom)
</P
><P
> Formerly, <TT
CLASS="COMMAND"
>LOAD</TT
> would attempt to unload and re-load the
module, but this is unsafe and not all that useful.
</P
></LI
><LI
><P
> Make window function <TT
CLASS="LITERAL"
>PARTITION BY</TT
> and <TT
CLASS="LITERAL"
>ORDER BY</TT
>
items always be interpreted as simple expressions (Tom)
</P
><P
> In 8.4.0 these lists were parsed following the rules used for
top-level <TT
CLASS="LITERAL"
>GROUP BY</TT
> and <TT
CLASS="LITERAL"
>ORDER BY</TT
> lists.
But this was not correct per the SQL standard, and it led to possible
circularity.
</P
></LI
><LI
><P
> Fix several errors in planning of semi-joins (Tom)
</P
><P
> These led to wrong query results in some cases where <TT
CLASS="LITERAL"
>IN</TT
>
or <TT
CLASS="LITERAL"
>EXISTS</TT
> was used together with another join.
</P
></LI
><LI
><P
> Fix handling of whole-row references to subqueries that are within
an outer join (Tom)
</P
><P
> An example is
<TT
CLASS="LITERAL"
>SELECT COUNT(ss.*) FROM ... LEFT JOIN (SELECT ...) ss ON ...</TT
>.
Here, <TT
CLASS="LITERAL"
>ss.*</TT
> would be treated as <TT
CLASS="LITERAL"
>ROW(NULL,NULL,...)</TT
>
for null-extended join rows, which is not the same as a simple NULL.
Now it is treated as a simple NULL.
</P
></LI
><LI
><P
> Fix Windows shared-memory allocation code (Tsutomu Yamada, Magnus)
</P
><P
> This bug led to the often-reported <SPAN
CLASS="QUOTE"
>"could not reattach
to shared memory"</SPAN
> error message.
</P
></LI
><LI
><P
> Fix locale handling with plperl (Heikki)
</P
><P
> This bug could cause the server's locale setting to change when a
plperl function is called, leading to data corruption.
</P
></LI
><LI
><P
> Fix handling of reloptions to ensure setting one option doesn't
force default values for others (Itagaki Takahiro)
</P
></LI
><LI
><P
> Ensure that a <SPAN
CLASS="QUOTE"
>"fast shutdown"</SPAN
> request will forcibly terminate
open sessions, even if a <SPAN
CLASS="QUOTE"
>"smart shutdown"</SPAN
> was already in progress
(Fujii Masao)
</P
></LI
><LI
><P
> Avoid memory leak for <CODE
CLASS="FUNCTION"
>array_agg()</CODE
> in <TT
CLASS="LITERAL"
>GROUP BY</TT
>
queries (Tom)
</P
></LI
><LI
><P
> Treat <CODE
CLASS="FUNCTION"
>to_char(..., 'TH')</CODE
> as an uppercase ordinal
suffix with <TT
CLASS="LITERAL"
>'HH'</TT
>/<TT
CLASS="LITERAL"
>'HH12'</TT
> (Heikki)
</P
><P
> It was previously handled as <TT
CLASS="LITERAL"
>'th'</TT
> (lowercase).
</P
></LI
><LI
><P
> Include the fractional part in the result of
<CODE
CLASS="FUNCTION"
>EXTRACT(second)</CODE
> and
<CODE
CLASS="FUNCTION"
>EXTRACT(milliseconds)</CODE
> for
<TT
CLASS="TYPE"
>time</TT
> and <TT
CLASS="TYPE"
>time with time zone</TT
> inputs (Tom)
</P
><P
> This has always worked for floating-point datetime configurations,
but was broken in the integer datetime code.
</P
></LI
><LI
><P
> Fix overflow for <TT
CLASS="LITERAL"
>INTERVAL '<TT
CLASS="REPLACEABLE"
><I
>x</I
></TT
> ms'</TT
>
when <TT
CLASS="REPLACEABLE"
><I
>x</I
></TT
> is more than 2 million and integer
datetimes are in use (Alex Hunsaker)
</P
></LI
><LI
><P
> Improve performance when processing toasted values in index scans (Tom)
</P
><P
> This is particularly useful for <A
HREF="http://postgis.net/"
TARGET="_top"
>PostGIS</A
>.
</P
></LI
><LI
><P
> Fix a typo that disabled <TT
CLASS="VARNAME"
>commit_delay</TT
> (Jeff Janes)
</P
></LI
><LI
><P
> Output early-startup messages to <TT
CLASS="FILENAME"
>postmaster.log</TT
> if the
server is started in silent mode (Tom)
</P
><P
> Previously such error messages were discarded, leading to
difficulty in debugging.
</P
></LI
><LI
><P
> Remove translated FAQs (Peter)
</P
><P
> They are now on the <A
HREF="http://wiki.postgresql.org/wiki/FAQ"
TARGET="_top"
>wiki</A
>. The
main FAQ was moved to the wiki some time ago.
</P
></LI
><LI
><P
> Fix <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
> to not go into an infinite loop if
<TT
CLASS="FILENAME"
>postgresql.conf</TT
> is empty (Jeff Davis)
</P
></LI
><LI
><P
> Fix several errors in <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
>'s
<TT
CLASS="LITERAL"
>--binary-upgrade</TT
> mode (Bruce, Tom)
</P
><P
> <TT
CLASS="LITERAL"
>pg_dump --binary-upgrade</TT
> is used by pg_migrator.
</P
></LI
><LI
><P
> Fix <TT
CLASS="FILENAME"
>contrib/xml2</TT
>'s <CODE
CLASS="FUNCTION"
>xslt_process()</CODE
> to
properly handle the maximum number of parameters (twenty) (Tom)
</P
></LI
><LI
><P
> Improve robustness of <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s code to recover
from errors during <TT
CLASS="COMMAND"
>COPY FROM STDIN</TT
> (Tom)
</P
></LI
><LI
><P
> Avoid including conflicting readline and editline header files
when both libraries are installed (Zdenek Kotala)
</P
></LI
><LI
><P
> Work around gcc bug that causes <SPAN
CLASS="QUOTE"
>"floating-point exception"</SPAN
>
instead of <SPAN
CLASS="QUOTE"
>"division by zero"</SPAN
> on some platforms (Tom)
</P
></LI
><LI
><P
> Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2009l
for DST law changes in Bangladesh, Egypt, Mauritius.
</P
></LI
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