QUERY PLAN
GroupAggregate (cost=55.46..55.53 rows=4 width=12)
Group Key: parent_id
-> Sort (cost=55.46..55.47 rows=4 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..55.42 rows=4 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1732,1786,1787,1788,1789}'::integer[])))