Change relblocknumber field of pg_buffercache view from numeric to int8

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 12a323b7a8d430e9bddae7c0155239d7a5790afc
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-05-31T00:07:47Z
Releases: 8.1.0
Change relblocknumber field of pg_buffercache view from numeric to int8
for efficiency's sake.  Mark Kirkwood.

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