Date: Wed, 13 Nov 2013 09:14:06 -0800 (PST)
From: David Johnston <polobo@yahoo.com>
To: pgsql-sql@postgresql.org
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Subject: Re: Function args: TEXT -vs- VARCHAR?
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Tom Lane-2 wrote
> skinner@.co

>  (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 ...

s/some/parenthetical/  ?

David J.


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