QUERY PLAN
GroupAggregate (cost=62.39..62.54 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=62.39..62.42 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..62.25 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{60,61,62,63,64,65,66,67,68,69}'::integer[])))