QUERY PLAN
GroupAggregate (cost=53.72..53.79 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=53.72..53.73 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..53.68 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1732,1786,1787,1788}'::integer[])))