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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Peter Eisentraut <[email protected]>
Cc: David Rowley <[email protected]>
Cc: David G. Johnston <[email protected]>
Cc: James Coleman <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Should we document how column DEFAULT expressions work?
Date: Mon, 01 Jul 2024 10:43:53 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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<[email protected]>
Peter Eisentraut <[email protected]> writes:
> On 01.07.24 01:54, David Rowley wrote:
>> I think there are valid reasons to use the special timestamp input
>> values. One that I can think of is for use with partition pruning. If
>> you have a time-range partitioned table and want the planner to prune
>> the partitions rather than the executor, you could use
>> 'now'::timestamp in your queries to allow the planner to prune.
> Yeah, but is that a good user interface? Or is that just something that
> happens to work now with the pieces that happened to be there, rather
> than a really designed interface?
That's not a very useful argument to make. What percentage of the
SQL language as a whole is legacy cruft that we'd do differently if
we could? I think the answer is depressingly high. Adding more
special-purpose features to the ones already there doesn't move
that needle in a desirable direction.
I'd be more excited about this discussion if I didn't think that
the chances of removing 'now'::timestamp are exactly zero. You
can't just delete useful decades-old features, whether there's
a better way or not.
regards, tom lane
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Subject: Re: Should we document how column DEFAULT expressions work?
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