On Wed, Nov 8, 2017 at 7:26 AM, Amit Kapila <amit.kapil...@gmail.com> wrote: > We do want to generate it later when there isn't inheritance involved, > but only if there is a single rel involved (simple_rel_array_size > <=2). The rule is something like this, we will generate the gather > paths at this stage only if there are more than two rels involved and > there isn't inheritance involved.
Why is that the correct rule? Sorry if I'm being dense here. I would have thought we'd want to skip it for the topmost scan/join rel regardless of the presence or absence of inheritance. -- 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
