Log Message:
-----------
Update performance discussion for 8.1. Add a little more explanatory
material in the EXPLAIN section, update examples to match current reality,
show examples of bitmap indexscans as well as plain ones.
Modified Files:
--------------
pgsql/doc/src/sgml:
perform.sgml (r1.51 -> r1.52)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/perform.sgml.diff?r1=1.51&r2=1.52)
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
