pgsql: Modify tidbitmap.c to avoid creating a hash table until there is

From: tgl(at)svr1(dot)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Modify tidbitmap.c to avoid creating a hash table until there is
Date: 2005-05-17 00:43:48
Message-ID: 20050517004348.1AF7652831@svr1.postgresql.org
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Log Message:
-----------
Modify tidbitmap.c to avoid creating a hash table until there is more
than one heap page represented in the bitmap. This is a bit ugly but
it cuts overhead fairly effectively in simple join cases. Per example
from Sergey Koposov.

Modified Files:
--------------
pgsql/src/backend/nodes:
tidbitmap.c (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/tidbitmap.c.diff?r1=1.2&r2=1.3)

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