Function LookupTypeNameOid

src/backend/parser/parse_type.c:233–256

* LookupTypeNameOid * Given a TypeName object, lookup the pg_type syscache entry of the type. * Returns InvalidOid if no such type can be found. If the type is found, * return its Oid. * * NB: direct callers of this function need to be aware that the type OID * returned may correspond to a shell type. Most code should go through * typenameTypeId instead. * * pstate is only used for e

 * pstate is only used for error location info, and may be NULL.
 */
Oid
LookupTypeNameOid(ParseState *pstate, const TypeName *typeName, bool missing_ok)
{
	Oid			typoid;
	Type		tup;

	tup = LookupTypeName(pstate, typeName, NULL, missing_ok);
	if (tup == NULL)
	{
		if (!missing_ok)
			ereport(ERROR,
					(errcode(ERRCODE_UNDEFINED_OBJECT),
					 errmsg("type \"%s\" does not exist",
							TypeNameToString(typeName)),
					 parser_errposition(pstate, typeName->location)));

		return InvalidOid;
	}

	typoid = ((Form_pg_type) GETSTRUCT(tup))->oid;
	ReleaseSysCache(tup);

	return typoid;
}

/*
 * typenameType - given a TypeName, return a Type structure and typmod