Log Message:
-----------
Dept of second thoughts: let's make sure that get_index_stats_hook is only
applied to expression indexes, not to plain relations. The original coding
in btcostestimate conflated the two cases, but it's not hard to use
get_relation_stats_hook instead when we're looking to the underlying relation.
Modified Files:
--------------
pgsql/src/backend/utils/adt:
selfuncs.c (r1.254 -> r1.255)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c?r1=1.254&r2=1.255)