Function CallStmtResultDesc

src/backend/commands/functioncmds.c:2901–2919

* Construct the tuple descriptor for a CALL statement return */

 * Construct the tuple descriptor for a CALL statement return
 */
TupleDesc
CallStmtResultDesc(CallStmt *stmt)
{
	FuncExpr   *fexpr;
	HeapTuple	tuple;
	TupleDesc	tupdesc;

	fexpr = stmt->funcexpr;

	tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(fexpr->funcid));
	if (!HeapTupleIsValid(tuple))
		elog(ERROR, "cache lookup failed for procedure %u", fexpr->funcid);

	tupdesc = build_function_result_tupdesc_t(tuple);

	ReleaseSysCache(tuple);

	return tupdesc;
}