Release date: 2011-12-05
This release contains a variety of fixes from 8.4.9. For information about new features in the 8.4 major release, see Section E.181.
A dump/restore is not required for those running 8.4.X.
    However, a longstanding error was discovered in the definition of the
    information_schema.referential_constraints view.  If you
    rely on correct results from that view, you should replace its
    definition as explained in the first changelog item below.
   
Also, if you are upgrading from a version earlier than 8.4.8, see Section E.173.
      Fix bugs in information_schema.referential_constraints view
      (Tom Lane)
     
This view was being insufficiently careful about matching the foreign-key constraint to the depended-on primary or unique key constraint. That could result in failure to show a foreign key constraint at all, or showing it multiple times, or claiming that it depends on a different constraint than the one it really does.
      Since the view definition is installed by initdb,
      merely upgrading will not fix the problem.  If you need to fix this
      in an existing installation, you can (as a superuser) drop the
      information_schema schema then re-create it by sourcing
      SHAREDIR/information_schema.sqlpg_config --sharedir if you're uncertain where
      SHAREDIR is.)  This must be repeated in each database
      to be fixed.
     
Fix incorrect replay of WAL records for GIN index updates (Tom Lane)
      This could result in transiently failing to find index entries after
      a crash, or on a hot-standby server.  The problem would be repaired
      by the next VACUUM of the index, however.
     
      Fix TOAST-related data corruption during CREATE TABLE dest AS
      SELECT * FROM src or INSERT INTO dest SELECT * FROM src
      (Tom Lane)
     
      If a table has been modified by ALTER TABLE ADD COLUMN,
      attempts to copy its data verbatim to another table could produce
      corrupt results in certain corner cases.
      The problem can only manifest in this precise form in 8.4 and later,
      but we patched earlier versions as well in case there are other code
      paths that could trigger the same bug.
     
Fix race condition during toast table access from stale syscache entries (Tom Lane)
The typical symptom was transient errors like “missing chunk number 0 for toast value NNNNN in pg_toast_2619”, where the cited toast table would always belong to a system catalog.
Track dependencies of functions on items used in parameter default expressions (Tom Lane)
      Previously, a referenced object could be dropped without having dropped
      or modified the function, leading to misbehavior when the function was
      used.  Note that merely installing this update will not fix the missing
      dependency entries; to do that, you'd need to CREATE OR
      REPLACE each such function afterwards.  If you have functions whose
      defaults depend on non-built-in objects, doing so is recommended.
     
Allow inlining of set-returning SQL functions with multiple OUT parameters (Tom Lane)
      Make DatumGetInetP() unpack inet datums that have a 1-byte
      header, and add a new macro, DatumGetInetPP(), that does
      not (Heikki Linnakangas)
     
      This change affects no core code, but might prevent crashes in add-on
      code that expects DatumGetInetP() to produce an unpacked
      datum as per usual convention.
     
      Improve locale support in money type's input and output
      (Tom Lane)
     
      Aside from not supporting all standard
      lc_monetary
      formatting options, the input and output functions were inconsistent,
      meaning there were locales in which dumped money values could
      not be re-read.
     
      Don't let transform_null_equals
      affect CASE foo WHEN NULL ... constructs
      (Heikki Linnakangas)
     
      transform_null_equals is only supposed to affect
      foo = NULL expressions written directly by the user, not
      equality checks generated internally by this form of CASE.
     
Change foreign-key trigger creation order to better support self-referential foreign keys (Tom Lane)
      For a cascading foreign key that references its own table, a row update
      will fire both the ON UPDATE trigger and the
      CHECK trigger as one event.  The ON UPDATE
      trigger must execute first, else the CHECK will check a
      non-final state of the row and possibly throw an inappropriate error.
      However, the firing order of these triggers is determined by their
      names, which generally sort in creation order since the triggers have
      auto-generated names following the convention
      “RI_ConstraintTrigger_NNNN”.  A proper fix would require
      modifying that convention, which we will do in 9.2, but it seems risky
      to change it in existing releases.  So this patch just changes the
      creation order of the triggers.  Users encountering this type of error
      should drop and re-create the foreign key constraint to get its
      triggers into the right order.
     
Avoid floating-point underflow while tracking buffer allocation rate (Greg Matthews)
While harmless in itself, on certain platforms this would result in annoying kernel log messages.
Preserve configuration file name and line number values when starting child processes under Windows (Tom Lane)
      Formerly, these would not be displayed correctly in the
      pg_settings view.
     
Preserve blank lines within commands in psql's command history (Robert Haas)
The former behavior could cause problems if an empty line was removed from within a string literal, for example.
Fix pg_dump to dump user-defined casts between auto-generated types, such as table rowtypes (Tom Lane)
Use the preferred version of xsubpp to build PL/Perl, not necessarily the operating system's main copy (David Wheeler and Alex Hunsaker)
      Fix incorrect coding in contrib/dict_int and
      contrib/dict_xsyn (Tom Lane)
     
      Some functions incorrectly assumed that memory returned by
      palloc() is guaranteed zeroed.
     
      Honor query cancel interrupts promptly in pgstatindex()
      (Robert Haas)
     
Ensure VPATH builds properly install all server header files (Peter Eisentraut)
Shorten file names reported in verbose error messages (Peter Eisentraut)
Regular builds have always reported just the name of the C file containing the error message call, but VPATH builds formerly reported an absolute path name.
Fix interpretation of Windows timezone names for Central America (Tom Lane)
      Map “Central America Standard Time” to CST6, not
      CST6CDT, because DST is generally not observed anywhere in
      Central America.
     
Update time zone data files to tzdata release 2011n for DST law changes in Brazil, Cuba, Fiji, Palestine, Russia, and Samoa; also historical corrections for Alaska and British East Africa.