QUERY PLAN
GroupAggregate (cost=68.48..68.70 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=68.48..68.52 rows=16 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..68.16 rows=16 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1565,1596,1641,1658,1647,1578,1577,1576,1566,1562,1561,1560,1559,1558,1557}'::integer[])))