Paul Lindner <lindner@inuus.com> writes:
> I believe I've found a performance regression between 8.0 and 8.1 for
> some cases. For some queries it appears that the old MIN() ran much
> faster than the new optimized MIN().
When you are complaining about planner mistakes, showing EXPLAIN rather
than EXPLAIN ANALYZE output is an entirely ineffective way of making
your point.
I suspect the problem is that there is a correlation between the
moo_summary_date and moo_summary_b_id columns, which the planner
will not realize --- is that the case?
regards, tom lane