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BUG #7556: "select not in sub query" plan very poor vs "not exists"

From: l1t(at)tom(dot)com
To: pgsql-bugs(at)postgresql(dot)org
Subject: BUG #7556: "select not in sub query" plan very poor vs "not exists"
Date: 2012-09-19 05:48:08
Message-ID: E1TED8q-00047D-Va@wrigleys.postgresql.org (view raw or flat)
Thread:
Lists: pgsql-bugs
The following bug has been logged on the website:

Bug reference:      7556
Logged by:          lt
Email address:      l1t(at)tom(dot)com
PostgreSQL version: 9.2.0
Operating system:   windows xp
Description:        

test=# create table sli_test (id int primary key,info varchar(20));
test=# insert into sli_test select
generate_series(1,1000000),'digoal'||generate_series(1,1000000);
test=# analyze verbose sli_test;
test=# create table sli_test2 (id int not null,info varchar(20));
test=#  insert into sli_test2 select
generate_series(1,1000000),'dbase'||generate_series(1,1000000);
test=# analyze verbose sli_test2;
test=# explain select max(a.info)from sli_test a where a.id not in(select
b.id from sli_test2 b where b.id<50000);
                                      QUERY PLAN
---------------------------------------------------------------------------------------
 Aggregate  (cost=9241443774.00..9241443774.01 rows=1 width=12)



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