QUERY PLAN
Aggregate (cost=100.75..100.76 rows=1 width=8)
-> Sort (cost=100.73..100.74 rows=1 width=224)
Sort Key: s.end_at, s.created_at DESC
InitPlan 1 (returns $0)
-> Aggregate (cost=48.89..48.90 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..48.84 rows=20 width=13)
Filter: ((tree_path IS NOT NULL) AND (head_of = 1001) AND (status = '1'::smallint))
-> Group (cost=51.82..51.83 rows=1 width=224)
Group Key: s.id
-> Sort (cost=51.82..51.82 rows=1 width=18)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..51.81 rows=1 width=18)
Filter: ((parent_id IS NULL) AND (tree_path @> $0) AND (head_of = 1001) AND (status = '1'::smallint))