QUERY PLAN
GroupAggregate (cost=63.85..64.15 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=63.85..63.90 rows=19 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.45 rows=19 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1684,1683,1671,1670,1647,1641,1564,1563,1508,1507}'::integer[])))