QUERY PLAN
Aggregate (cost=104.66..104.67 rows=1 width=8)
-> Sort (cost=104.64..104.64 rows=1 width=224)
Sort Key: s.end_at, s.created_at DESC
InitPlan 1 (returns $0)
-> Aggregate (cost=50.74..50.75 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..50.73 rows=2 width=13)
Filter: ((tree_path IS NOT NULL) AND (head_of = 1001) AND (status = '0'::smallint))
-> Group (cost=53.87..53.88 rows=1 width=224)
Group Key: s.id
-> Sort (cost=53.87..53.87 rows=1 width=18)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..53.86 rows=1 width=18)
Filter: ((parent_id IS NULL) AND (tree_path @> $0) AND (head_of = 1001) AND (status = '0'::smallint))