QUERY PLAN
GroupAggregate (cost=53.00..53.07 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=53.00..53.01 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.96 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1768,1734,1596}'::integer[])))