QUERY PLAN
GroupAggregate (cost=158.78..158.89 rows=5 width=12)
Group Key: parent_id
-> Sort (cost=158.78..158.80 rows=7 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..158.69 rows=7 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1564,1562,1561,1560,1559,1558,1557,1563}'::integer[])))