Hi,
I have an issue with a table partitioned by one boolean column. The
query planner only seems to skip the non matching table if expired (the
column I use for the partition) is true.
Here is a simple example:
CREATE TABLE mos (type_id INTEGER UNIQUE, expired boolean);
CREATE TABLE mos_expired_1 ( CHECK ( expired = true ) ) INHERITS (mos);
CREATE TABLE mos_active_1 ( CHECK ( expired = false ) ) INHERITS (mos);
INSERT INTO mos_expired_1 (type_id,expired) VALUES(1, true);
INSERT INTO mos_active_1 (type_id,expired) VALUES(2, false);
EXPLAIN SELECT * from mos where expired = true;
Result (cost=0.00..66.60 rows=2330 width=5)
-> Append (cost=0.00..66.60 rows=2330 width=5)
-> Seq Scan on mos (cost=0.00..33.30 rows=1165 width=5)
Filter: expired
-> Seq Scan on mos_expired_1 mos (cost=0.00..33.30 rows=1165
width=5)
Filter: expired
EXPLAIN SELECT * from mos where expired = false;
Result (cost=0.00..99.90 rows=3495 width=5)
-> Append (cost=0.00..99.90 rows=3495 width=5)
-> Seq Scan on mos (cost=0.00..33.30 rows=1165 width=5)
Filter: (NOT expired)
-> Seq Scan on mos_expired_1 mos (cost=0.00..33.30 rows=1165
width=5)
Filter: (NOT expired)
-> Seq Scan on mos_active_1 mos (cost=0.00..33.30 rows=1165
width=5)
Filter: (NOT expired)
I would really like to know if I am missing something or it's a query
planner issue.
--
Dominik Sander
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