QUERY PLAN
GroupAggregate (cost=75.61..75.66 rows=3 width=12)
Group Key: task_group_id
-> Sort (cost=75.61..75.62 rows=3 width=4)
Sort Key: task_group_id
-> Seq Scan on tbl_tasks (cost=0.00..75.59 rows=3 width=4)
Filter: ((parent_id IS NULL) AND (status = 0) AND (task_group_id = ANY ('{203,202,201,200,199,198,197,196,194,193,192,191,190,189,188,187,178,141,140,139}'::integer[])))