QUERY PLAN
GroupAggregate (cost=64.39..64.54 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=64.39..64.42 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..64.25 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{225,228,230,242,250,251,261,266,267,268}'::integer[])))