Simple select give wrong result when it uses the Bitmap Heap Scan path.
postgres=# CREATE OR REPLACE FUNCTION my_exec_im_test_func(i integer)
RETURNS integer AS $$
BEGIN
RETURN i + 1;
END;
$$ LANGUAGE plpgsql;
CREATE FUNCTION
postgres=# set enable_seqscan=off;
SET
postgres=# set enable_indexscan=off;
SET
postgres=# select proname from pg_proc where proname like 'my_pro1';
proname
----------------------
my_exec_im_test_proc
(1 row)
postgres=# explain select proname from pg_proc where proname like 'my_pro1';
QUERY
PLAN
--------------------------------------------------------------------------------
-------------
Bitmap Heap Scan on pg_proc (cost=4.26..8.27 rows=1 width=64)
Recheck Cond: (proname ~~ 'my_pro1'::text)
-> Bitmap Index Scan on pg_proc_proname_args_nsp_index (cost=0.00..4.26
row
s=1 width=0)
Index Cond: ((proname >= 'my'::name) AND (proname < 'mz'::name))
(4 rows)
--
Rushabh Lathia
www.EnterpriseDB.com
