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help / color / mirror / Atom feedFrom: David G. Johnston <[email protected]>
To: David Rowley <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: James Coleman <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Should we document how column DEFAULT expressions work?
Date: Sun, 30 Jun 2024 17:15:43 -0700
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On Sun, Jun 30, 2024 at 4:55 PM David Rowley <[email protected]> wrote:
>
> I'd like to know what led someone down the path of doing something
> like DEFAULT 'now()'::timestamp in a CREATE TABLE. Could it be a
> faulty migration tool that created these and people copy them thinking
> it's a legitimate syntax?
>
>
My thought process on this used to be: Provide a text string of the
expression that is then stored within the catalog and eval'd during
runtime. If the only thing you are providing is a single literal and not
some compound expression it isn't that obvious that you are supposed to
provide an unquoted expression - which feels like it should be immediately
evaluated - versus something that is a constant. Kinda like dynamic SQL.
David J.
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Subject: Re: Should we document how column DEFAULT expressions work?
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