QUERY PLAN
GroupAggregate (cost=63.64..63.79 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=63.64..63.67 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.50 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1338,1347,1348,1349,1350,1353,1356,1357,1358,1359}'::integer[])))