| From: | Berend Tober <btober(at)seaworthysys(dot)com> |
|---|---|
| To: | Michael Fuhr <mike(at)fuhr(dot)org> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Multi-parameter aggregates. |
| Date: | 2005-11-21 17:33:15 |
| Message-ID: | 438204DB.7080406@seaworthysys.com |
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| Thread: | |
| Lists: | pgsql-general |
Michael Fuhr wrote:
>On Mon, Nov 21, 2005 at 11:03:22AM -0500, Berend Tober wrote:
>
>
>>I'm interested in defining a covariance aggregate function.
>>
>>
>
>I think aggregates must take a single value, so the above won't
>work as written. However, in PostgreSQL 8.0 or later you could
>define the aggregate's base type to be a composite type
>
Thanks. I briefly explored something like that, using the existing POINT
data type, but didn't press it too far, pending mailling list advice.
Regards,
Berend
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