Re: Request for improvement: Allow to push (t.o).id via GROUP BY ocd.o - Mailing list pgsql-hackers

Hello

to my mind I may be done, because `id` is primary key of `o` table

Friday, July 12, 2019, 1:04:27 PM, you wrote:

> Hello PostgreSQL-development,

> something's stopping the planner from being able to deduce that
> (t.o).id is safe to push through a GROUP BY ocd.o

>         SELECT * FROM (
>                         SELECT
>                                 sum( t.group_suma ) OVER( PARTITION BY t.id ) AS total_suma,
> --                              sum( t.group_suma ) OVER( PARTITION
> BY (t.o).id ) AS total_suma,  -- For any WHERE this takes 2700ms
>                                 *
>                         FROM (
>                                 SELECT
>                                  sum( ocd.item_cost     ) AS group_cost,
>                                  sum( ocd.item_suma     ) AS group_suma,
>                                  max( (ocd.ic).consumed ) AS consumed,
>                                  (ocd.ic).consumed_period,
>                                  ocd.o,
>                                  (ocd.o).id
>                                 FROM order_cost_details( tstzrange(
> '2019-04-01', '2019-05-01' ) ) ocd
>                                 GROUP BY ocd.o, (ocd.o).id, (ocd.ic).consumed_period
>                         ) t
>         ) t
>         WHERE t.id = 6154 AND t.consumed_period @>
> '2019-04-01'::timestamptz       -- This takes 2ms
> --      WHERE (t.o).id = 6154 AND t.consumed_period @>
> '2019-04-01'::timestamptz   -- This takes 2700ms


> More info is here: https://stackoverflow.com/q/57003113/4632019




-- 
Best regards,
Eugen Konkov