QUERY PLAN
GroupAggregate (cost=165.22..165.38 rows=7 width=12)
Group Key: parent_id
-> Sort (cost=165.22..165.25 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..165.00 rows=12 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1618,1617,1616,1615,1600,1598,1592,1591,1583,1537,1536,1535}'::integer[])))