QUERY PLAN
GroupAggregate (cost=75.98..76.33 rows=15 width=12)
Group Key: parent_id
-> Sort (cost=75.98..76.05 rows=26 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..75.37 rows=26 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1565,1596,1641,1686,1647,1696,1668,1578,1577,1576,1566,1562,1561,1560,1559,1558,1557,1509,1456}'::integer[])))