On Fri, Jun 30, 2017 at 9:32 AM, Mark Dilger <hornschnor...@gmail.com> wrote: >> On Jun 29, 2017, at 8:55 PM, Mark Dilger <hornschnor...@gmail.com> wrote: >> Changing myfunc to create a temporary table, to execute the sql to populate >> that temporary table, and to then loop through the temporary table's rows >> fixes the problem. For the real-world example where I hit this, that single >> change decreases the runtime from 13.5 seconds to 2.5 seconds. > > Actually, this is wrong. On further review, by the time I had changed the > function definition, the data in the test server I was querying had likely > changed > enough for the performance to change. That duped me into thinking I had > found a work-around. I can no longer reproduce any performance improvement > in this manner.
Also note that temporary tables are yet another thing that doesn't work with parallel query yet. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers