|From:||Eugen Konkov <kes-kes(at)yandex(dot)ru>|
|To:||Andreas Karlsson <andreas(at)proxel(dot)se>, PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>|
|Subject:||Re: [PATCH] distinct aggregates within a window function WIP|
|Views:||Raw Message | Whole Thread | Download mbox | Resend email|
Tuesday, April 21, 2020, 6:17:00 PM, you wrote:
> On 4/21/20 5:06 PM, Eugen Konkov wrote:
>> Hi. I read the thread.
>> Probably this fiddle will be helpful for testing:
>> I recently encountered a problem:
>> Why Window-specific functions do not allow DISTINCT to be used within the function argument list?
>> sum( DISTINCT order_cost ) OVER ( PARTITION BY invoice_id ORDER BY invoice_id, group_id RANGE unbound preceeding and unbound following )
>> behavior is quite deterministic:
>> ORDER BY will create peers in partition
>> DISTINCT will get only one peer
>> I resolve my problem via two subqueries, but it seems this logic may
>> be applied to window functions (did not check this for other functions thought)
> Sorry, I do not follow. What problem did you encounter?
Lack of DISTINCT for window function SUM
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