QUERY PLAN
GroupAggregate (cost=57.94..58.11 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=57.94..57.97 rows=11 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..57.75 rows=11 width=4)
Filter: (parent_id = ANY ('{1596,1641,1636,1637,1591,1639,1585,1347,1358,1359}'::integer[]))