Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp> writes:
>> Just for quick note, it seems query 19 takes forever. Have you
>> successfully run Q19?
> Here is the more detailed info. The query was not finished within 3
> days and was canceled on a Dual Xeon 2.8GHz with 2.5GB RAM running
> Linux. PostgreSQL is 7.4.5 with default postgresql.conf.
7.4's planner is not able to do anything useful with the complicated
WHERE clause in Q19. I believe I've improved that situation for 8.0.
A really slick solution will probably have to await the appearance of
bitmap indexes, though.
regards, tom lane