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From: Peter Eisentraut <[email protected]>
To: Vik Fearing <[email protected]>
To: PostgreSQL Hackers <[email protected]>
Subject: Re: ANY_VALUE aggregate
Date: Wed, 18 Jan 2023 16:06:02 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

On 05.12.22 21:18, Vik Fearing wrote:
> On 12/5/22 15:57, Vik Fearing wrote:
>> The SQL:2023 Standard defines a new aggregate named ANY_VALUE.  It 
>> returns an implementation-dependent (i.e. non-deterministic) value 
>> from the rows in its group.
>>
>> PFA an implementation of this aggregate.
> 
> Here is v2 of this patch.  I had forgotten to update sql_features.txt.

In your patch, the documentation says the definition is any_value("any") 
but the catalog definitions are any_value(anyelement).  Please sort that 
out.

Since the transition function is declared strict, null values don't need 
to be checked.  I think the whole function could be reduced to

Datum
any_value_trans(PG_FUNCTION_ARGS)
{
     PG_RETURN_DATUM(PG_GETARG_DATUM(0));
}

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