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From: Tom Lane on 19 May 2010 14:15
Bogdan Vlad <bogdancvlad(a)gmail.com> writes:
> How can I determine the pg_class oid of the argument type in a
> polymorphic C function when it's called with a table row?

You're confusing pg_class oid with pg_type oid. The type oid
of the function argument is necessarily going to be a *type* oid.

You can look at the pg_type row to find the associated pg_class oid,
if it's a composite type (it might not be!)

regards, tom lane

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