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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: skinner@britvault.co.uk
Cc: pgsql-sql@postgresql.org
Subject: Re: Function args: TEXT -vs- VARCHAR?
Date: Wed, 13 Nov 2013 11:36:42 -0500
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skinner@britvault.co.uk (Craig R. Skinner) writes:
> On 2013-11-13 Wed 06:34 AM |, Adrian Klaver wrote:
>> The full SQL type syntax is allowed for input arguments and return
>> value. However, some details of the type specification (e.g., the
>> precision field for type numeric) are the responsibility of the
>> underlying function implementation and are silently swallowed (i.e.,
>> not recognized or enforced) by the CREATE FUNCTION command.
> That's rather vague..... "... some details ..."
What's ignored by CREATE FUNCTION (and, indeed, pretty much the entire
type inference mechanism) is typmod. So any parenthesized modifier for
a type name is not considered. Usually those are length/precision
constraints, but user-defined types might do something else with them.
> An explicit table of datatype & what's "silently swallowed" would be
> valuable to clarify this topic that's said to be often repeatedly asked.
Can't be asked that often, as that text has been untouched for more
than a dozen years ...
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, skinner@britvault.co.uk
Subject: Re: Function args: TEXT -vs- VARCHAR?
In-Reply-To: <6365.1384360602@sss.pgh.pa.us>
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