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From: Laurenz Albe <[email protected]>
To: Vik Fearing <[email protected]>
To: PostgreSQL Hackers <[email protected]>
Subject: Re: Add support for AT LOCAL
Date: Tue, 06 Jun 2023 09:56:42 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Mon, 2023-06-05 at 23:13 -0400, Vik Fearing wrote:
> The Standard defines time zone conversion as follows:
> 
> <datetime factor> ::=
>    <datetime primary> [ <time zone> ]
> 
> <time zone> ::=
>    AT <time zone specifier>
> 
> <time zone specifier> ::=
>      LOCAL
>    | TIME ZONE <interval primary>
> 
> 
> While looking at something else, I noticed we do not support AT LOCAL. 
> The local time zone is defined as that of *the session*, not the server, 
> which can make this quite interesting in views where the view will 
> automatically adjust to the session's time zone.
> 
> Patch against 3f1aaaa180 attached.

+1 on the idea; it should be faily trivial, if not very useful.

At a quick glance, it looks like you resolve "timezone" at the time
the query is parsed.  Shouldn't the resolution happen at query
execution time?

Yours,
Laurenz Albe

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