QUERY PLAN
GroupAggregate (cost=60.52..60.71 rows=10 width=12)
Group Key: parent_id
-> Sort (cost=60.52..60.55 rows=12 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..60.30 rows=12 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1347,1349,1356,1358,1596,1734,1823,1830}'::integer[])))