PG_FINALLY

This gives an alternative way of catching exceptions, for the common
case where the cleanup code is the same in the error and non-error
cases.  So instead of

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_CATCH();
    {
        cleanup();
	PG_RE_THROW();
    }
    PG_END_TRY();
    cleanup();

one can write

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_FINALLY();
    {
        cleanup();
    }
    PG_END_TRY();

Discussion: https://www.postgresql.org/message-id/flat/95a822c3-728b-af0e-d7e5-71890507ae0c%402ndquadrant.com

contrib/jsonb_plpython/jsonb_plpython.c

@@ -307,15 +307,12 @@ PLyMapping_ToJsonbValue(PyObject *obj, JsonbParseState **jsonb_state)
 
 		out = pushJsonbValue(jsonb_state, WJB_END_OBJECT, NULL);
 	}
-	PG_CATCH();
+	PG_FINALLY();
 	{
 		Py_DECREF(items);
-		PG_RE_THROW();
 	}
 	PG_END_TRY();
 
-	Py_DECREF(items);
-
 	return out;
 }