QUERY PLAN
HashAggregate (cost=77.32..77.53 rows=21 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..77.15 rows=34 width=4)
Filter: (parent_id = ANY ('{1338,1347,1348,1349,1350,1353,1356,1357,1358,1359,1586,1596,1641,1647,1652,1683,1684,1686,1687,1696}'::integer[]))