On Sat, Oct 29, 2016 at 6:55 AM, Kim Rose Carlsen <k...@hiper.dk> wrote: >> try this :-D > >> create or replace function indf(anyelement, anyelement) returns anyelement >> as >> $$ >> select $1 = $2 or ($1 is null and $2 is null); >> $$ language sql; >> >> CREATE VIEW view_circuit_with_status AS ( >> SELECT r.*, >> s.circuit_status, >> s.customer_id AS s_customer_id, >> p.line_speed, >> p.customer_id AS p_customer_id >> FROM view_circuit r >> JOIN view_circuit_product_main s >> ON r.circuit_id = s.circuit_id >> AND indf(r.customer_id, s.customer_id) >> JOIN view_circuit_product p >> ON r.circuit_id = p.circuit_id >> AND indf(r.customer_id, s.customer_id) >> >> merlin > > This doesn't do much good. This doesn't tell the planner that the 3 > customer_ids are actually of same value, and it therefore can't filter them > as it sees fit.
You do know you can index on a function, and the planner then keeps stats on it when you run analyze right? -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
