Thread: pgsql: Fix a performance regression in 8.2: optimization of MIN/MAX into

pgsql: Fix a performance regression in 8.2: optimization of MIN/MAX into

From

tgl@postgresql.org (Tom Lane)

Date:

06 February 2007, 05:50:30

Log Message:
-----------
Fix a performance regression in 8.2: optimization of MIN/MAX into indexscans
had stopped working for tables buried inside views or sub-selects.  This is
because I had gotten rid of the simplify_jointree() preprocessing step, and
optimize_minmax_aggregates() wasn't smart enough to deal with a non-canonical
FromExpr.  Per gripe from Bill Howe.

Modified Files:
--------------
    pgsql/src/backend/optimizer/plan:
        planagg.c (r1.25 -> r1.26)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/planagg.c.diff?r1=1.25&r2=1.26)