Changes 8.2.12:

* Improve handling of URLs in headline() function
* Improve handling of overlength headlines in headline() function
* Prevent possible Assert failure or misconversion if an encoding
  conversion is created with the wrong conversion function for the
  specified pair of encodings
* Fix possible Assert failure if a statement executed in PL/pgSQL is
  rewritten into another kind of statement, for example if an
  "INSERT" is rewritten into an "UPDATE"
* Ensure that a snapshot is available to datatype input functions
* Make it safer for SPI-using functions to be used within datatype
  I/O; in particular, to be used in domain check constraints
* Avoid unnecessary locking of small tables in "VACUUM"
* Fix a problem that made UPDATE RETURNING tableoid return zero
  instead of the correct OID
* Fix planner misestimation of selectivity when transitive equality
  is applied to an outer-join clause
  This could result in bad plans for queries like ... from a left
  join b on a.a1 = b.b1 where a.a1 = 42 ...
* Improve optimizer's handling of long IN lists
  This change avoids wasting large amounts of time on such lists when
  constraint exclusion is enabled.
* Ensure that the contents of a holdable cursor don't depend on the
  contents of TOAST tables
* Fix memory leak when a set-returning function is terminated without
  reading its whole result
* Fix "contrib/dblink"'s dblink_get_result(text,bool) function
* Fix possible garbage output from "contrib/sslinfo" functions
* Fix configure script to properly report failure when unable to
  obtain linkage information for PL/Perl
* Make all documentation reference pgsql-bugs and/or pgsql-hackers as
  appropriate, instead of the now-decommissioned pgsql-ports and
  pgsql-patches mailing lists
* Update time zone data files to tzdata release 2009a (for Kathmandu
  and historical DST corrections in Switzerland, Cuba)

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