QUERY PLAN
GroupAggregate (cost=64.39..64.54 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=64.39..64.42 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..64.25 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{127,132,134,136,137,138,139,142,150,156}'::integer[])))