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<!-- doc/src/sgml/release-8.4.sgml -->
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<!-- See header comment in release.sgml about typical markup -->
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<sect1 id="release-8-4-7">
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<title>Release 8.4.7</title>
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<title>Release date</title>
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<simpara>2011-01-31</simpara>
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This release contains a variety of fixes from 8.4.6.
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For information about new features in the 8.4 major release, see
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<xref linkend="release-8-4">.
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<title>Migration to Version 8.4.7</title>
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A dump/restore is not required for those running 8.4.X.
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However, if you are upgrading from a version earlier than 8.4.2,
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see the release notes for 8.4.2.
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<title>Changes</title>
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Avoid failures when <command>EXPLAIN</> tries to display a simple-form
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<literal>CASE</> expression (Tom Lane)
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If the <literal>CASE</>'s test expression was a constant, the planner
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could simplify the <literal>CASE</> into a form that confused the
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expression-display code, resulting in <quote>unexpected CASE WHEN
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Fix assignment to an array slice that is before the existing range
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of subscripts (Tom Lane)
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If there was a gap between the newly added subscripts and the first
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pre-existing subscript, the code miscalculated how many entries needed
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to be copied from the old array's null bitmap, potentially leading to
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data corruption or crash.
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Avoid unexpected conversion overflow in planner for very distant date
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The <type>date</> type supports a wider range of dates than can be
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represented by the <type>timestamp</> types, but the planner assumed it
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could always convert a date to timestamp with impunity.
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Fix <application>pg_restore</>'s text output for large objects (BLOBs)
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when <varname>standard_conforming_strings</> is on (Tom Lane)
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Although restoring directly to a database worked correctly, string
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escaping was incorrect if <application>pg_restore</> was asked for
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SQL text output and <varname>standard_conforming_strings</> had been
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enabled in the source database.
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Fix erroneous parsing of <type>tsquery</> values containing
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<literal>... & !(subexpression) | ...</literal> (Tom Lane)
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Queries containing this combination of operators were not executed
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correctly. The same error existed in <filename>contrib/intarray</>'s
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<type>query_int</> type and <filename>contrib/ltree</>'s
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<type>ltxtquery</> type.
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Fix buffer overrun in <filename>contrib/intarray</>'s input function
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for the <type>query_int</> type (Apple)
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This bug is a security risk since the function's return address could
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be overwritten. Thanks to Apple Inc's security team for reporting this
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issue and supplying the fix. (CVE-2010-4015)
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Fix bug in <filename>contrib/seg</>'s GiST picksplit algorithm
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This could result in considerable inefficiency, though not actually
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incorrect answers, in a GiST index on a <type>seg</> column.
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If you have such an index, consider <command>REINDEX</>ing it after
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installing this update. (This is identical to the bug that was fixed in
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<filename>contrib/cube</> in the previous update.)
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<sect1 id="release-8-4-6">
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<title>Release 8.4.6</title>
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<title>Release date</title>
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<simpara>2010-12-16</simpara>
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This release contains a variety of fixes from 8.4.5.
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For information about new features in the 8.4 major release, see
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<xref linkend="release-8-4">.
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<title>Migration to Version 8.4.6</title>
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A dump/restore is not required for those running 8.4.X.
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However, if you are upgrading from a version earlier than 8.4.2,
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see the release notes for 8.4.2.
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<title>Changes</title>
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<link linkend="guc-wal-sync-method"><varname>wal_sync_method</></link>
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to be <literal>fdatasync</> on Linux (Tom Lane, Marti Raudsepp)
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The default on Linux has actually been <literal>fdatasync</> for many
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years, but recent kernel changes caused <productname>PostgreSQL</> to
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choose <literal>open_datasync</> instead. This choice did not result
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in any performance improvement, and caused outright failures on
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certain filesystems, notably <literal>ext4</> with the
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<literal>data=journal</> mount option.
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Fix assorted bugs in WAL replay logic for GIN indexes (Tom Lane)
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This could result in <quote>bad buffer id: 0</> failures or
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corruption of index contents during replication.
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Fix recovery from base backup when the starting checkpoint WAL record
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is not in the same WAL segment as its redo point (Jeff Davis)
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Fix persistent slowdown of autovacuum workers when multiple workers
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remain active for a long time (Tom Lane)
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The effective <varname>vacuum_cost_limit</> for an autovacuum worker
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could drop to nearly zero if it processed enough tables, causing it
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to run extremely slowly.
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Add support for detecting register-stack overrun on <literal>IA64</>
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The <literal>IA64</> architecture has two hardware stacks. Full
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prevention of stack-overrun failures requires checking both.
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Add a check for stack overflow in <function>copyObject()</> (Tom Lane)
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Certain code paths could crash due to stack overflow given a
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sufficiently complex query.
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Fix detection of page splits in temporary GiST indexes (Heikki
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It is possible to have a <quote>concurrent</> page split in a
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temporary index, if for example there is an open cursor scanning the
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index when an insertion is done. GiST failed to detect this case and
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hence could deliver wrong results when execution of the cursor
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Fix error checking during early connection processing (Tom Lane)
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The check for too many child processes was skipped in some cases,
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possibly leading to postmaster crash when attempting to add the new
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child process to fixed-size arrays.
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Improve efficiency of window functions (Tom Lane)
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Certain cases where a large number of tuples needed to be read in
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advance, but <varname>work_mem</> was large enough to allow them all
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to be held in memory, were unexpectedly slow.
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<function>percent_rank()</>, <function>cume_dist()</> and
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<function>ntile()</> in particular were subject to this problem.
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Avoid memory leakage while <command>ANALYZE</>'ing complex index
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expressions (Tom Lane)
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Ensure an index that uses a whole-row Var still depends on its table
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An index declared like <literal>create index i on t (foo(t.*))</>
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would not automatically get dropped when its table was dropped.
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Do not <quote>inline</> a SQL function with multiple <literal>OUT</>
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parameters (Tom Lane)
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This avoids a possible crash due to loss of information about the
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expected result rowtype.
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Behave correctly if <literal>ORDER BY</>, <literal>LIMIT</>,
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<literal>FOR UPDATE</>, or <literal>WITH</> is attached to the
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<literal>VALUES</> part of <literal>INSERT ... VALUES</> (Tom Lane)
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Fix constant-folding of <literal>COALESCE()</> expressions (Tom Lane)
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The planner would sometimes attempt to evaluate sub-expressions that
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in fact could never be reached, possibly leading to unexpected errors.
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Fix postmaster crash when connection acceptance
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(<function>accept()</> or one of the calls made immediately after it)
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fails, and the postmaster was compiled with GSSAPI support (Alexander
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Fix missed unlink of temporary files when <varname>log_temp_files</>
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If an error occurred while attempting to emit the log message, the
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unlink was not done, resulting in accumulation of temp files.
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Add print functionality for <structname>InhRelation</> nodes (Tom Lane)
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This avoids a failure when <varname>debug_print_parse</> is enabled
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and certain types of query are executed.
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Fix incorrect calculation of distance from a point to a horizontal
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line segment (Tom Lane)
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This bug affected several different geometric distance-measurement
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Fix incorrect calculation of transaction status in
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<application>ecpg</> (Itagaki Takahiro)
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Fix <application>PL/pgSQL</>'s handling of <quote>simple</>
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expressions to not fail in recursion or error-recovery cases (Tom Lane)
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Fix <application>PL/Python</>'s handling of set-returning functions
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Attempts to call SPI functions within the iterator generating a set
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Fix bug in <filename>contrib/cube</>'s GiST picksplit algorithm
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This could result in considerable inefficiency, though not actually
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incorrect answers, in a GiST index on a <type>cube</> column.
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If you have such an index, consider <command>REINDEX</>ing it after
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installing this update.
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Don't emit <quote>identifier will be truncated</> notices in
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<filename>contrib/dblink</> except when creating new connections
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Fix potential coredump on missing public key in
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<filename>contrib/pgcrypto</> (Marti Raudsepp)
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Fix memory leak in <filename>contrib/xml2</>'s XPath query functions
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Update time zone data files to <application>tzdata</> release 2010o
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for DST law changes in Fiji and Samoa;
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also historical corrections for Hong Kong.
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<sect1 id="release-8-4-5">
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<title>Release 8.4.5</title>
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doc/src/sgml/release-8.4.sgml
