On Fri, May 28, 2010 at 12:07 AM, Joseph Adams <joeyadams3.14...@gmail.com> wrote: > 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. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise Postgres Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
