On 2013-10-02 18:56:51 +0200, Pavel Stehule wrote: > Hello > > this proposal is related to reported issue > http://www.postgresql.org/message-id/E1VQuta-0007Y4-Ip@wrigleys.postgresql.org > > > We can directly modify any fields of int, float, double arrays (when result > size will be immutable). This trick is used now for acceleration of some > aggregates. > > Ideas, comments?
A specific array might be located directly on a buffer - starting to manipulate them inplace will lead to havoc in such scenarios. I don't think we have the infrastructure for detecting such cases.
If you can do a update of some array in plpgsql now, then you have to work with local copy only. It is a necessary precondition, and I am think it is valid.
Pavel
Greetings,
Andres Freund -- Andres Freund http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
