From: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
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To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Teodor Sigaev <teodor(at)sigaev(dot)ru>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: User-defined typle similar to char(length) varchar(length) |
Date: | 2006-08-04 14:27:12 |
Message-ID: | 20060804142712.GI2478@svana.org |
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Lists: | pgsql-hackers |
On Thu, Aug 03, 2006 at 05:37:21PM -0700, elein wrote:
> I can think of histograms as a data type which may take more than one argument,
> maybe even an array for boundary information. I think the direction *in the
> long term* should be to allow multiple arguments (as a ROW type?) and other
> base or complex types as arguments. The value would be a type itself and
> the datatype must do the right thing regarding it. This may not be practical
> for short-term, but would open up initialization parameters for user-defined
> typed.
Two problems:
1. The storage of the type cannot be affected by the typmod, because
you're not going to always have it available.
2. It's got to be a single integer (int4 I think)
So histograms would have to store the bounds some other way anyway...
I think multiple arguments would be cool but we have to keep in mind
the limitations of typmod.
Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.
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