From: | Sergiy Zuban <s(dot)zuban(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | postgres_fdw - IS TRUE/FALSE conditions are not pushed down |
Date: | 2014-07-18 18:38:56 |
Message-ID: | CAGz8fGabvwUehJ8ssiFRFPmT80ymXToChhTzHbWpmfXq86DmNQ@mail.gmail.com |
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Lists: | pgsql-general |
Hi
I've setup foreign table and noticed inconsistency how conditionals handled
for boolean columns.
explain verbose select * from temporary_testing.t_proxied where active is
true;
QUERY PLAN
------------------------------------------------------------
--------------------------
Foreign Scan on temporary_testing.t_proxied (cost=100.00..194.72
rows=1412 width=5)
Output: id, active
Filter: (t_proxied.active IS TRUE)
Remote SQL: SELECT id, active FROM main_testing.t_url
But, when = used instead of IS it works correctly. All conditions below
(including IS NULL) are pushed down to remote server:
explain verbose select * from temporary_testing.t_proxied where active;
explain verbose select * from temporary_testing.t_proxied where
NOT(active);
explain verbose select * from temporary_testing.t_proxied where active =
false;
explain verbose select * from temporary_testing.t_proxied where active =
true;
------------------------------------------------------------
--------------------------
Foreign Scan on temporary_testing.t_proxied (cost=100.00..166.48
rows=1412 width=5)
Output: id, active
Remote SQL: SELECT id, active FROM main_testing.t_url WHERE (active)
explain verbose select * from temporary_testing.t_proxied where active is
null;
QUERY PLAN
------------------------------------------------------------
------------------------
Foreign Scan on temporary_testing.t_proxied (cost=100.00..138.52 rows=14
width=5)
Output: id, active
Remote SQL: SELECT id, active FROM main_testing.t_url WHERE ((active IS
NULL))
DO I need to report this as bug?
Tested on PostgreSQL 9.3.4
--
Sergiy Zuban
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