On Wed, Mar 9, 2016 at 12:07 PM, Alvaro Herrera <alvhe...@2ndquadrant.com> wrote: > Tom Lane wrote: >> Amit Kapila <amit.kapil...@gmail.com> writes: > >> > Without setting max_parallel_degree, it works fine and generate the >> > appropriate results. Here the issue seems to be that the code in >> > grouping_planner doesn't apply the required PathTarget to Path below Gather >> > Path due to which when we generate target list for scan plan, >> >> Yeah, fixed. I had assumed that the existing coding in create_gather_plan >> was OK, because it looked like it was right for a non-projecting node. >> But actually Gather can project (why though?), so it's not right. > > This looks related: > https://www.postgresql.org/message-id/CA%2BTgmoai9Ruhwk61110rY4cNAzoO6npsFEOaEKjM7Zz8i3evHg%40mail.gmail.com
I actually wrote a patch for this: http://www.postgresql.org/message-id/CA+TgmoaqWH8W35c7pssuufxOO=axneqen4da_bkeqaa3se3...@mail.gmail.com I assume it no longer applies :-( but I think it would be good to get this into 9.6. It's a pretty simple optimization with a lot to recommend it. -- 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
