From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: kes-kes@yandex.ru
Subject: BUG #16968: Planner does not recognize optimization
Date: Fri, 16 Apr 2021 19:18:45 +0000
Message-ID: <16968-9c8a1708c1c04355@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 16968
Logged by: Eugen Konkov
Email address: kes-kes@yandex.ru
PostgreSQL version: 13.1
Operating system: Linux Mint 19.3
Description:
TLDR;
If I refer to same column by different ways planner may or may not recognize
optimization
select * from order_total_suma() ots where agreement_id = 3943;
-- fast
select * from order_total_suma() ots where (ots.o).agreement_id = 3943; --
slow
Where `order_total_suma` is sql function:
SELECT
sum( ocd.item_suma ) OVER( PARTITION BY (ocd.o).agreement_id
) AS agreement_suma,
sum( ocd.item_suma ) OVER( PARTITION BY (ocd.o).agreement_id,
(ocd.o).id ) AS order_suma,
sum( ocd.item_cost ) OVER( PARTITION BY (ocd.o).agreement_id,
(ocd.o).id, (ocd.ic).consumed_period ) AS group_cost,
sum( ocd.item_suma ) OVER( PARTITION BY (ocd.o).agreement_id,
(ocd.o).id, (ocd.ic).consumed_period ) AS group_suma,
max( (ocd.ic).consumed ) OVER( PARTITION BY (ocd.o).agreement_id,
(ocd.o).id, (ocd.ic).consumed_period ) AS consumed,
ocd.item_qty, ocd.item_price, ocd.item_cost, ocd.item_suma,
ocd.o, ocd.c, ocd.p, ocd.ic,
(ocd.o).id as order_id,
(ocd.o).agreement_id as agreement_id
FROM order_cost_details( _target_range ) ocd
Problem is window function, because ID can not go through. But this occur
not always.
When I filter by field I partition result by then optimization occur
BUT only when I create an alias for this field and do filtering via this
alias.
Expected: apply optimization not only when I do `WHERE agreement_id = XXX`
but and for `WHERE (ots.o).agreement_id = XXX`
Thank you.
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Subject: Re: BUG #16968: Planner does not recognize optimization
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