Re: Weird type selection choice

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От Peter Eisentraut
Тема Re: Weird type selection choice
Дата
Msg-id 200711061650.09188.peter_e@gmx.net
обсуждение исходный текст
Ответ на Weird type selection choice  (Peter Eisentraut <peter_e@gmx.net>)
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Am Dienstag, 6. November 2007 schrieb Peter Eisentraut:
> I noticed this problem in 8.2 and 8.3:
>
> pei=# select mod( trunc( 1 ), 2 );
> ERROR:  42883: function mod(double precision, integer) does not exist
> LINE 1: select mod( trunc( 1 ), 2 );
>                ^
>
> It apparently casts the 1 to double precision to pick the variant
> trunc(dp)=>dp instead of trunc(numeric)=>numeric.  I was under the
> impression that we didn't want to cast integers to float types implicitly
> because this loses information.

Well, duh, of course we can't disallow casting integer to float.  But can we 
make it prefer numeric as a target if available?

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/


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