QUERY PLAN
Aggregate (cost=297.04..297.05 rows=1 width=8)
-> Group (cost=297.02..297.03 rows=1 width=224)
Group Key: s.id
InitPlan 1 (returns $0)
-> Aggregate (cost=147.00..147.01 rows=1 width=32)
-> Seq Scan on tbl_tasks s_1 (cost=0.00..144.00 rows=1200 width=13)
Filter: (tree_path IS NOT NULL)
-> Sort (cost=150.01..150.01 rows=1 width=4)
Sort Key: s.id
-> Seq Scan on tbl_tasks s (cost=0.00..150.00 rows=1 width=4)
Filter: ((parent_id IS NULL) AND (tree_path @> $0) AND (task_group_id = 78))