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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-8-4-9"
>E.88. Release 8.4.9</A
></H1
><DIV
CLASS="FORMALPARA"
><P
><B
>Release date: </B
>2011-09-26</P
></DIV
><P
>   This release contains a variety of fixes from 8.4.8.
   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="AEN126154"
>E.88.1. Migration to Version 8.4.9</A
></H2
><P
>    A dump/restore is not required for those running 8.4.X.
   </P
><P
>    However, if you are upgrading from a version earlier than 8.4.8,
    see <A
HREF="release-8-4-8.html"
>Section E.89</A
>.
   </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN126159"
>E.88.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Fix bugs in indexing of in-doubt HOT-updated tuples (Tom Lane)
     </P
><P
>      These bugs could result in index corruption after reindexing a system
      catalog.  They are not believed to affect user indexes.
     </P
></LI
><LI
><P
>      Fix multiple bugs in GiST index page split processing (Heikki
      Linnakangas)
     </P
><P
>      The probability of occurrence was low, but these could lead to index
      corruption.
     </P
></LI
><LI
><P
>      Fix possible buffer overrun in <CODE
CLASS="FUNCTION"
>tsvector_concat()</CODE
>
      (Tom Lane)
     </P
><P
>      The function could underestimate the amount of memory needed for its
      result, leading to server crashes.
     </P
></LI
><LI
><P
>      Fix crash in <CODE
CLASS="FUNCTION"
>xml_recv</CODE
> when processing a
      <SPAN
CLASS="QUOTE"
>"standalone"</SPAN
> parameter (Tom Lane)
     </P
></LI
><LI
><P
>      Make <CODE
CLASS="FUNCTION"
>pg_options_to_table</CODE
> return NULL for an option with no
      value (Tom Lane)
     </P
><P
>      Previously such cases would result in a server crash.
     </P
></LI
><LI
><P
>      Avoid possibly accessing off the end of memory in <TT
CLASS="COMMAND"
>ANALYZE</TT
>
      and in SJIS-2004 encoding conversion (Noah Misch)
     </P
><P
>      This fixes some very-low-probability server crash scenarios.
     </P
></LI
><LI
><P
>      Prevent intermittent hang in interactions of startup process with
      bgwriter process (Simon Riggs)
     </P
><P
>      This affected recovery in non-hot-standby cases.
     </P
></LI
><LI
><P
>      Fix race condition in relcache init file invalidation (Tom Lane)
     </P
><P
>      There was a window wherein a new backend process could read a stale init
      file but miss the inval messages that would tell it the data is stale.
      The result would be bizarre failures in catalog accesses, typically
      <SPAN
CLASS="QUOTE"
>"could not read block 0 in file ..."</SPAN
> later during startup.
     </P
></LI
><LI
><P
>      Fix memory leak at end of a GiST index scan (Tom Lane)
     </P
><P
>      Commands that perform many separate GiST index scans, such as
      verification of a new GiST-based exclusion constraint on a table
      already containing many rows, could transiently require large amounts of
      memory due to this leak.
     </P
></LI
><LI
><P
>      Fix incorrect memory accounting (leading to possible memory bloat) in
      tuplestores supporting holdable cursors and plpgsql's <TT
CLASS="LITERAL"
>RETURN
      NEXT</TT
> command (Tom Lane)
     </P
></LI
><LI
><P
>      Fix performance problem when constructing a large, lossy bitmap
      (Tom Lane)
     </P
></LI
><LI
><P
>      Fix join selectivity estimation for unique columns (Tom Lane)
     </P
><P
>      This fixes an erroneous planner heuristic that could lead to poor
      estimates of the result size of a join.
     </P
></LI
><LI
><P
>      Fix nested PlaceHolderVar expressions that appear only in sub-select
      target lists (Tom Lane)
     </P
><P
>      This mistake could result in outputs of an outer join incorrectly
      appearing as NULL.
     </P
></LI
><LI
><P
>      Allow nested <TT
CLASS="LITERAL"
>EXISTS</TT
> queries to be optimized properly (Tom
      Lane)
     </P
></LI
><LI
><P
>      Fix array- and path-creating functions to ensure padding bytes are
      zeroes (Tom Lane)
     </P
><P
>      This avoids some situations where the planner will think that
      semantically-equal constants are not equal, resulting in poor
      optimization.
     </P
></LI
><LI
><P
>      Fix <TT
CLASS="COMMAND"
>EXPLAIN</TT
> to handle gating Result nodes within
      inner-indexscan subplans (Tom Lane)
     </P
><P
>      The usual symptom of this oversight was <SPAN
CLASS="QUOTE"
>"bogus varno"</SPAN
> errors.
     </P
></LI
><LI
><P
>      Work around gcc 4.6.0 bug that breaks WAL replay (Tom Lane)
     </P
><P
>      This could lead to loss of committed transactions after a server crash.
     </P
></LI
><LI
><P
>      Fix dump bug for <TT
CLASS="LITERAL"
>VALUES</TT
> in a view (Tom Lane)
     </P
></LI
><LI
><P
>      Disallow <TT
CLASS="LITERAL"
>SELECT FOR UPDATE/SHARE</TT
> on sequences (Tom Lane)
     </P
><P
>      This operation doesn't work as expected and can lead to failures.
     </P
></LI
><LI
><P
>      Fix <TT
CLASS="COMMAND"
>VACUUM</TT
> so that it always updates
      <TT
CLASS="LITERAL"
>pg_class</TT
>.<TT
CLASS="LITERAL"
>reltuples</TT
>/<TT
CLASS="LITERAL"
>relpages</TT
> (Tom
      Lane)
     </P
><P
>      This fixes some scenarios where autovacuum could make increasingly poor
      decisions about when to vacuum tables.
     </P
></LI
><LI
><P
>      Defend against integer overflow when computing size of a hash table (Tom
      Lane)
     </P
></LI
><LI
><P
>      Fix cases where <TT
CLASS="COMMAND"
>CLUSTER</TT
> might attempt to access
      already-removed TOAST data (Tom Lane)
     </P
></LI
><LI
><P
>      Fix portability bugs in use of credentials control messages for
      <SPAN
CLASS="QUOTE"
>"peer"</SPAN
> authentication (Tom Lane)
     </P
></LI
><LI
><P
>      Fix SSPI login when multiple roundtrips are required (Ahmed Shinwari,
      Magnus Hagander)
     </P
><P
>      The typical symptom of this problem was <SPAN
CLASS="QUOTE"
>"The function requested is
      not supported"</SPAN
> errors during SSPI login.
     </P
></LI
><LI
><P
>      Throw an error if <TT
CLASS="FILENAME"
>pg_hba.conf</TT
> contains <TT
CLASS="LITERAL"
>hostssl</TT
>
      but SSL is disabled (Tom Lane)
     </P
><P
>      This was concluded to be more user-friendly than the previous behavior
      of silently ignoring such lines.
     </P
></LI
><LI
><P
>      Fix typo in <CODE
CLASS="FUNCTION"
>pg_srand48</CODE
> seed initialization (Andres Freund)
     </P
><P
>      This led to failure to use all bits of the provided seed.  This function
      is not used on most platforms (only those without <CODE
CLASS="FUNCTION"
>srandom</CODE
>),
      and the potential security exposure from a less-random-than-expected
      seed seems minimal in any case.
     </P
></LI
><LI
><P
>      Avoid integer overflow when the sum of <TT
CLASS="LITERAL"
>LIMIT</TT
> and
      <TT
CLASS="LITERAL"
>OFFSET</TT
> values exceeds 2^63 (Heikki Linnakangas)
     </P
></LI
><LI
><P
>      Add overflow checks to <TT
CLASS="TYPE"
>int4</TT
> and <TT
CLASS="TYPE"
>int8</TT
> versions of
      <CODE
CLASS="FUNCTION"
>generate_series()</CODE
> (Robert Haas)
     </P
></LI
><LI
><P
>      Fix trailing-zero removal in <CODE
CLASS="FUNCTION"
>to_char()</CODE
> (Marti Raudsepp)
     </P
><P
>      In a format with <TT
CLASS="LITERAL"
>FM</TT
> and no digit positions
      after the decimal point, zeroes to the left of the decimal point could
      be removed incorrectly.
     </P
></LI
><LI
><P
>      Fix <CODE
CLASS="FUNCTION"
>pg_size_pretty()</CODE
> to avoid overflow for inputs close to
      2^63 (Tom Lane)
     </P
></LI
><LI
><P
>      Weaken plpgsql's check for typmod matching in record values (Tom Lane)
     </P
><P
>      An overly enthusiastic check could lead to discarding length modifiers
      that should have been kept.
     </P
></LI
><LI
><P
>      Correctly handle quotes in locale names during <SPAN
CLASS="APPLICATION"
>initdb</SPAN
>
      (Heikki Linnakangas)
     </P
><P
>      The case can arise with some Windows locales, such as <SPAN
CLASS="QUOTE"
>"People's
      Republic of China"</SPAN
>.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_upgrade</SPAN
> to preserve toast tables' relfrozenxids
      during an upgrade from 8.3 (Bruce Momjian)
     </P
><P
>      Failure to do this could lead to <TT
CLASS="FILENAME"
>pg_clog</TT
> files being
      removed too soon after the upgrade.
     </P
></LI
><LI
><P
>      In <SPAN
CLASS="APPLICATION"
>pg_ctl</SPAN
>, support silent mode for service registrations
      on Windows (MauMau)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s counting of script file line numbers during
      <TT
CLASS="LITERAL"
>COPY</TT
> from a different file (Tom Lane)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
>'s direct-to-database mode for
      <TT
CLASS="VARNAME"
>standard_conforming_strings</TT
> (Tom Lane)
     </P
><P
>      <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> could emit incorrect commands when restoring
      directly to a database server from an archive file that had been made
      with <TT
CLASS="VARNAME"
>standard_conforming_strings</TT
> set to <TT
CLASS="LITERAL"
>on</TT
>.
     </P
></LI
><LI
><P
>      Be more user-friendly about unsupported cases for parallel
      <SPAN
CLASS="APPLICATION"
>pg_restore</SPAN
> (Tom Lane)
     </P
><P
>      This change ensures that such cases are detected and reported before
      any restore actions have been taken.
     </P
></LI
><LI
><P
>      Fix write-past-buffer-end and memory leak in <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s
      LDAP service lookup code (Albe Laurenz)
     </P
></LI
><LI
><P
>      In <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>, avoid failures when using nonblocking I/O
      and an SSL connection (Martin Pihlak, Tom Lane)
     </P
></LI
><LI
><P
>      Improve libpq's handling of failures during connection startup
      (Tom Lane)
     </P
><P
>      In particular, the response to a server report of <CODE
CLASS="FUNCTION"
>fork()</CODE
>
      failure during SSL connection startup is now saner.
     </P
></LI
><LI
><P
>      Improve <SPAN
CLASS="APPLICATION"
>libpq</SPAN
>'s error reporting for SSL failures (Tom
      Lane)
     </P
></LI
><LI
><P
>      Fix <CODE
CLASS="FUNCTION"
>PQsetvalue()</CODE
> to avoid possible crash when adding a new
      tuple to a <TT
CLASS="STRUCTNAME"
>PGresult</TT
> originally obtained from a server
      query (Andrew Chernow)
     </P
></LI
><LI
><P
>      Make <SPAN
CLASS="APPLICATION"
>ecpglib</SPAN
> write <TT
CLASS="TYPE"
>double</TT
> values with 15 digits
      precision (Akira Kurosawa)
     </P
></LI
><LI
><P
>      In <SPAN
CLASS="APPLICATION"
>ecpglib</SPAN
>, be sure <TT
CLASS="LITERAL"
>LC_NUMERIC</TT
> setting is
      restored after an error (Michael Meskes)
     </P
></LI
><LI
><P
>      Apply upstream fix for blowfish signed-character bug (CVE-2011-2483)
      (Tom Lane)
     </P
><P
>      <TT
CLASS="FILENAME"
>contrib/pg_crypto</TT
>'s blowfish encryption code could give
      wrong results on platforms where char is signed (which is most),
      leading to encrypted passwords being weaker than they should be.
     </P
></LI
><LI
><P
>      Fix memory leak in <TT
CLASS="FILENAME"
>contrib/seg</TT
> (Heikki Linnakangas)
     </P
></LI
><LI
><P
>      Fix <CODE
CLASS="FUNCTION"
>pgstatindex()</CODE
> to give consistent results for empty
      indexes (Tom Lane)
     </P
></LI
><LI
><P
>      Allow building with perl 5.14 (Alex Hunsaker)
     </P
></LI
><LI
><P
>      Update configure script's method for probing existence of system
      functions (Tom Lane)
     </P
><P
>      The version of autoconf we used in 8.3 and 8.2 could be fooled by
      compilers that perform link-time optimization.
     </P
></LI
><LI
><P
>      Fix assorted issues with build and install file paths containing spaces
      (Tom Lane)
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2011i
      for DST law changes in Canada, Egypt, Russia, Samoa, and South Sudan.
     </P
></LI
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