QUERY PLAN
GroupAggregate (cost=57.22..57.31 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=57.22..57.23 rows=5 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.16 rows=5 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1732,1786,1787,1788,1789,1790}'::integer[])))