QUERY PLAN
GroupAggregate (cost=54.10..54.31 rows=11 width=12)
Group Key: parent_id
-> Sort (cost=54.10..54.13 rows=13 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.86 rows=13 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1713,1777,1810,1811}'::integer[])))