From: | Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
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To: | "'Ken Been *EXTERN*'" <kbbeen(at)gmail(dot)com>, Melvin Davidson <melvin6925(at)gmail(dot)com> |
Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: interperting type oid in C code |
Date: | 2015-10-20 09:19:38 |
Message-ID: | A737B7A37273E048B164557ADEF4A58B50FBC59F@ntex2010i.host.magwien.gv.at |
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Lists: | pgsql-general |
Ken Been wrote:
> I'm working on a foreign data wrapper and I want to switch based on the column type.
> Specifically, if the column type in the external table is the same as in the (locally defined) foreign
> table then I can get some speedup for some types.
>
> Through the ForeignScanState object I can get TupleDesc and AttInMetadata opjects, and
> through there I can get the Oid of the column type, but now I'm stumped. How can I programmatically
> check whether Oid X refers to type int4, or whatever?
> Thanks, but I actually wanted to do it from C code. But anyway I think I found the answer: use the
> symbolic constants in catalog/pg_type.h, such as INT4OID.
That's fine, there is no problem with doing that.
Yours,
Laurenz Albe
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