QUERY PLAN
GroupAggregate (cost=63.59..63.74 rows=8 width=12)
Group Key: parent_id
-> Sort (cost=63.59..63.62 rows=9 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..63.45 rows=9 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{134,142,156,213,214,215,216,218,219,223}'::integer[])))