Message-ID: <e771e5ad-b58f-cfdb-1f66-22d630c99a0a@gmail.com>
Date: Mon, 7 Nov 2022 01:02:41 +0530
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Subject: Re: Todo item: distinct clause - guidance
To: Laurenz Albe <laurenz.albe@cybertec.at>, pgsql-novice@lists.postgresql.org
References: <fa46c213-c8a8-1123-d212-10db7919cd8a@gmail.com>
 <bcd7b41fe5c31e489dbf2b84f71e54435b34594b.camel@cybertec.at>
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From: Ankit Kumar Pandey <itsankitkp@gmail.com>
In-Reply-To: <bcd7b41fe5c31e489dbf2b84f71e54435b34594b.camel@cybertec.at>
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On 07/11/22 00:42, Laurenz Albe wrote:
> On Sun, 2022-11-06 at 18:39 +0530, Ankit Kumar Pandey wrote:
>> I was looking for some to-do item to pick up and came across 'Implement DISTINCT
>> clause in window aggregates'. Can someone pleaseelaborate what is expectation here?
>> Do feature request still exists as DISTINCT worked as expected if we try functions
>> like avg(distinct col)?
> Whis is about window functions, like
>
>    WITH q(a,b) AS (VALUES (1, 1), (1, 1), (2, 1))
>    SELECT *,
>           count(DISTINCT a) OVER (PARTITION BY b)
>    FROM q;
>
>    ERROR:  DISTINCT is not implemented for window functions
>    LINE 3:        count(DISTINCT a) OVER (PARTITION BY b)
>                   ^
>
> Yours,
> Laurenz Albe

Thanks a lot Laurenz, I got the issue now. I was looking at aggregation 
function without windowing.

I will revisit this again.


Thanks,

Ankit