QUERY PLAN
HashAggregate (cost=72.46..72.62 rows=16 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..72.31 rows=29 width=4)
Filter: (parent_id = ANY ('{1565,1596,1641,1686,1647,1696,1668,1578,1577,1576,1566,1562,1561,1560,1559,1558,1557,1509,1456}'::integer[]))