QUERY PLAN
GroupAggregate (cost=63.37..63.52 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=63.37..63.39 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.23 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1456,1509,1557,1558,1559,1560,1561,1562,1565,1566}'::integer[])))