Re: sub-select in IN clause results in sequential scan

On Wed, Oct 28, 2009 at 6:13 PM, Anj Adu <fotographs(at)gmail(dot)com> wrote:

> Postgres consistently does a sequential scan on the child partitions
> for this query
>
> select * from partitioned_table
> where partitioned_column > current_timestamp - interval 8 days
> where x in (select yy from z where colname like 'aaa%')
>
> If I replace the query with
>
> select * from partitioned_table
> where partitioned_column > current_timestamp - interval 8 days
> where x in (hardcode_value)
>
> The results are in line with expectation (very fast and uses a Bitmap
> Index Scan on the column X)
> \

use JOIN luke..

--
GJ