On Fri, May 28, 2010 at 12:07 AM, Joseph Adams
> I learned that to return an enum value from C, one needs to return the
> OID of the right row of the pg_enum table. I eventually managed to
> write the code below, which is mostly based on the enum_in function in
> src/backend/utils/adt/enum.c .
PG_RETURN macros shouldn't do any nontrivial processing (see the
existing ones for references). I assume you have the enum labels
declared in pg_enum.h, so I think you can just return the correct OID
values directly. Declare constants for them in pg_enum.h and then
just do PG_RETURN_OID(whatever).
#define JSONTypeNullOid ...
#define JSONTypeStringOid ...
#define JSONTypeNumberOid ...
It really shouldn't be necessary to do a catalog lookup to retrieve a constant.
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