ROW_COUNT expected to show # of created/updated rows

[jshen-r7]

ROW_COUNT reports the number of updated or created rows in a plpgsql block, but seems not to work with any Agensgraph DML.

test=*# DO $$
DECLARE
    dummy INTEGER;
BEGIN
    CREATE (m {"name": 'M1'});

    GET DIAGNOSTICS dummy = ROW_COUNT;

    RAISE NOTICE 'Number of rows created: %', dummy;
END;
$$;
NOTICE:  Number of rows created: 0
DO