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From: "Josh Berkus" <josh@agliodbs.com>
Subject: Re: Re: Re: DateDiff, IsNull?
To: Alan Gutierrez <alangutierrez@hotmail.com>, pgsql-sql@postgresql.org
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Date: Wed, 15 Aug 2001 08:10:36 -0700
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Alan, Tom, Ross, etc:

> > Well, Alan, overloading operators is sort of important to the user
> > definable types in postgresql. And any cross-type functionality,
> actually.

Hmmm ... I wasn't aware that what SQL does is "operator overloading",
per se.

Instead, I was under the SQL-spec impression that operators were defined
within the context of their relative datatypes, and only within that
context.

For example, currently 730::INT / 7::INT works fine, but '2
years'::INTERVAL / '1 week'::INTERVAL gives me an "operator not defined"
error.  This is because nobody has had time to define the operator "/"
in the context of INTERVAL / INTERVAL.  When someone does (oh please?
grovel, grovel) it will be defined, not overloaded.

Similarly, the operator "+" has no standard defintion in the context of
VARCHAR + VARCHAR.  So how is defining it as a concatination operator
(whatever other problems there might be with that) "overloading"?

Or am I missing the point?

-Josh Berkus






 


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