postgresql-base-9.0.3

* Before exiting walreceiver, ensure all the received WAL is fsync'd
to disk (Heikki Linnakangas)
Otherwise the standby server could replay some un-synced WAL,
conceivably leading to data corruption if the system crashes just
at that point.
* Avoid excess fsync activity in walreceiver (Heikki Linnakangas)
* Make «ALTER TABLE» revalidate uniqueness and exclusion constraints
when needed (Noah Misch)
This was broken in 9.0 by a change that was intended to suppress
revalidation during «VACUUM FULL» and «CLUSTER», but
unintentionally affected «ALTER TABLE» as well.
* Fix EvalPlanQual for «UPDATE» of an inheritance tree in which the
tables are not all alike (Tom Lane)
Any variation in the table row types (including dropped columns
present in only some child tables) would confuse the EvalPlanQual
code, leading to misbehavior or even crashes. Since EvalPlanQual is
only executed during concurrent updates to the same row, the
problem was only seen intermittently.
* Avoid failures when «EXPLAIN» tries to display a simple-form CASE
expression (Tom Lane)
If the CASE's test expression was a constant, the planner could
simplify the CASE into a form that confused the expression-display
code, resulting in «unexpected CASE WHEN clause» errors.
* Fix assignment to an array slice that is before the existing range
of subscripts (Tom Lane)
If there was a gap between the newly added subscripts and the first
pre-existing subscript, the code miscalculated how many entries
needed to be copied from the old array's null bitmap, potentially
leading to data corruption or crash.
* Avoid unexpected conversion overflow in planner for very distant
date values (Tom Lane)
The date type supports a wider range of dates than can be
represented by the timestamp types, but the planner assumed it
could always convert a date to timestamp with impunity.
* Fix PL/Python crash when an array contains null entries (Alex
Hunsaker)
* Remove ecpg's fixed length limit for constants defining an array
dimension (Michael Meskes)
* Fix erroneous parsing of tsquery values containing ... &
!(subexpression) | ... (Tom Lane)
Queries containing this combination of operators were not executed
correctly. The same error existed in «contrib/intarray»'s query_int
type and «contrib/ltree»'s ltxtquery type.
* Fix buffer overrun in «contrib/intarray»'s input function for the
query_int type (Apple)
This bug is a security risk since the function's return address
could be overwritten. Thanks to Apple Inc's security team for
reporting this issue and supplying the fix. (CVE-2010-4015)
* Fix bug in «contrib/seg»'s GiST picksplit algorithm (Alexander
Korotkov)
This could result in considerable inefficiency, though not actually
incorrect answers, in a GiST index on a seg column. If you have
such an index, consider «REINDEX"ing it after installing this
update. (This is identical to the bug that was fixed in
„contrib/cube“ in the previous update.)