In response to Charles Holleran :
> Why is it slow when the same un-functionized query was fast? The tbl_a has
> est. 30,000,000 records. It has an index for (x,y) pairs. It has an index for
> date_observed. So good results on the straight query. Where did I go wrong
> with the function?
The planner isn't able to choose the right plan because he don't know
the actual parameters.
You can do EXECUTE 'string that contains your query' to enforce
re-planning the query.
http://www.postgresql.org/docs/current/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
Regards, Andreas
--
Andreas Kretschmer
Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99