On Mon, Jul 26, 2010 at 2:09 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:
> I understand, but with only text accepting, then CONCAT will has much
> less benefit - you can't do a numeric list, for example
>
> see concat(c1::text, ',', c2::text, ',' ...)
>
> with this is much simpler use a pipes '' || c1 || ',' || c2 ... and
> this operator does necessary cast self.
>
> This function is probably one use case of exception from our rules.
At least two, right? Because for that use case you'd probably want
concat_ws(). In fact, it's hard for me to think of a variadic text
function where you wouldn't want the "no casts" behavior you're
getting via ANY.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company