Log Message:
-----------
Keep heap_page_prune from marking the buffer dirty when it didn't
really change anything. Per report from Itagaki Takahiro. Fix by
Pavan Deolasee.

Modified Files:
--------------
pgsql/src/backend/access/heap:
pruneheap.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsw...?r1=1.2&r2=1.3)

---------------------------(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