QUERY PLAN
GroupAggregate (cost=53.39..53.50 rows=6 width=12)
Group Key: parent_id
-> Sort (cost=53.39..53.41 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.29 rows=7 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1641,1647,1671,1670}'::integer[])))