On Tue, Jun 25, 2013 at 11:02:40AM -0400, Robert Haas wrote: > On Tue, Jun 25, 2013 at 9:21 AM, Bruce Momjian <br...@momjian.us> wrote: > > On Tue, Jun 25, 2013 at 03:48:19PM +0300, Yuri Levinsky wrote: > >> Hi, > >> > >> Do we have any plans to implement Hash Partitioning, maybe I missing this > >> feature? > > > > You can do it by writing your own constraint and trigger functions that > > control the hashing. > > Not really. Constraint exclusion won't kick in for a constraint like > CHECK (hashme(a) % 16 == 3) and a WHERE clause of the form a = 42.
Uh, I thought we checked the constant against every CHECK constraint and only scanned partitions that matched. Why does this not work? > Of course, since partitioning generally doesn't improve performance in > PostgreSQL anyway, it's not clear why you'd want to do this in the I think partitioning does improve performance by reducing index depth. -- Bruce Momjian <br...@momjian.us> http://momjian.us EnterpriseDB http://enterprisedb.com + It's impossible for everything to be true. + -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
