Log Message:
-----------
Tweak set_rel_width() to avoid redundant executions of getrelid().
In very large queries this accounts for a noticeable fraction of
planning time. Per an example from Greg Stark.
Modified Files:
--------------
pgsql/src/backend/optimizer/path:
costsize.c (r1.179 -> r1.180)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c.diff?r1=1.179&r2=1.180)
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TIP 6: explain analyze is your friend
