On Wed, Dec 23, 2015 at 2:34 AM, Dilip Kumar <dilipbal...@gmail.com> wrote: >> I think the gather-reader-order patch will fix this. Here's a test >> with all three patches. > > Yeah right, After applying all three patches this problem is fixed, now > parallel hash join is faster than normal hash join.
Thanks. I've committed the two smaller patches; it seems fairly clear that those are good changes independent of the parallel join stuff. > I have tested one more case which Amit mentioned, I can see in that case > parallel plan (parallel degree>= 3) is still slow, In Normal case it selects > "Hash Join" but in case of parallel worker > 3 it selects Parallel "Nest > Loop Join" which is making it costlier. Hmm, I'm not sure why that is happening. I'll poke at it a bit. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
