Log Message:
-----------
Fix choose_bitmap_and() so that partial index predicates are considered when
deciding whether a potential additional indexscan is redundant or not. As now
coded, any use of a partial index that was already used in a previous AND arm
will be rejected as redundant. This might be overly restrictive, but not
considering the point at all is definitely bad, as per example in bug #2441
from Arjen van der Meijden. In particular, a clauseless scan of a partial
index was *never* considered redundant by the previous coding, and that's
surely wrong. Being more flexible would also require some consideration
of how not to double-count the index predicate's selectivity.

Tags:
----
REL8_1_STABLE

Modified Files:
--------------
pgsql/src/backend/optimizer/path:
indxpath.c (r1.191.2.7 -> r1.191.2.8)
(http://developer.postgresql.org/cvsw...7&r2=1.191.2.8)

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