Re: Problem with Bitmap Heap Scan

"Rushabh Lathia" <rushabh.lathia@gmail.com> writes:
> Simple select give wrong result when it uses the Bitmap Heap Scan path.

It's generally appropriate to mention which PG version you're working
with when you report a bug.

> 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)

Hmm, the ~~ condition should get treated as a "filter" not a "recheck".
I suppose I broke this somewhere ...
        regards, tom lane