On 6/6/17 13:52, Regina Obe wrote: > It seems CREATE AGGREGATE was expanded in 9.6 to support parallelization of > aggregate functions using transitions, with the addition of serialfunc and > deserialfunc to the aggregate definitions. > > https://www.postgresql.org/docs/10/static/sql-createaggregate.html > > I was looking at the PostgreSQL 10 source code for some example usages of > this and was hoping that array_agg and string_agg would support the feature.
I'm not sure how you would parallelize these, since in most uses you want to have a deterministic output order. -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
