QUERY PLAN
HashAggregate (cost=91.88..92.11 rows=23 width=12)
Group Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..91.66 rows=43 width=4)
Filter: (parent_id = ANY ('{1338,1347,1348,1349,1350,1353,1356,1357,1358,1359,1586,1596,1641,1647,1652,1683,1684,1686,1687,1696,1697,1723,1734,1735,1745,1746,1751,1754,1768}'::integer[]))