QUERY PLAN
GroupAggregate (cost=51.85..51.92 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=51.85..51.86 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..51.81 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1596,1641,1630,1629}'::integer[])))