QUERY PLAN
Sort (cost=103.85..103.85 rows=1 width=200)
Sort Key: s.target_completed_at, s.created_at DESC
InitPlan 1 (returns $0)
-> Aggregate (cost=48.93..48.94 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..48.91 rows=8 width=13)
Filter: ((tree_path IS NOT NULL) AND (head_of = 1000) AND (status = '0'::smallint))
-> Group (cost=54.89..54.90 rows=1 width=200)
Group Key: s.id
-> Sort (cost=54.89..54.89 rows=1 width=200)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..54.88 rows=1 width=200)
Filter: ((tree_path @> $0) AND (head_of = 1000) AND (status = '0'::smallint) AND (parent_id = 1648))