| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Jim C(dot) Nasby" <decibel(at)decibel(dot)org> |
| Cc: | Gregory Youngblood <pgcluster(at)netio(dot)org>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, Chris Travers <chris(at)travelamericas(dot)com>, Merlin Moncure <merlin(dot)moncure(at)rcsonline(dot)com>, PostgreSQL advocacy <pgsql-advocacy(at)postgresql(dot)org>, pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: [GENERAL] MySQL to PostgreSQL, was ENUM type |
| Date: | 2005-07-29 19:57:48 |
| Message-ID: | 18607.1122667068@sss.pgh.pa.us |
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| Lists: | pgsql-advocacy pgsql-general |
"Jim C. Nasby" <decibel(at)decibel(dot)org> writes:
> Is there any serious impediment to adding unsigned types to PostgreSQL?
Quick, what's the datatype of 12345? And why?
My guess is that transparent support for such a thing would require some
tricky and fragile compromises in the numeric hierarchy's promotion
rules. The handling of smallint is already pretty unsatisfactory
because "12345" is considered int not smallint; adding three or four
unsigned types would make that problem many times worse.
> I don't think these would even have to be in core, if that's a
> concern.
Sure, if you don't need it to work reasonably nicely --- although the
promotion rules are now embedded in pg_cast and hence modifiable, the
initial determination of a datatype for a numeric literal is still
hard-wired in the grammar.
regards, tom lane
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