QUERY PLAN
Sort (cost=2786.12..2788.62 rows=1000 width=370)
Sort Key: (date(tt.dt))
-> HashAggregate (cost=2718.79..2736.29 rows=1000 width=370)
Group Key: tt.dt, p.day_at, p.user_id
-> Hash Left Join (cost=2698.54..2711.29 rows=1000 width=354)
Hash Cond: (date(tt.dt) = p.day_at)
-> Function Scan on generate_series tt (cost=0.02..10.02 rows=1000 width=8)
-> Hash (cost=2686.69..2686.69 rows=947 width=346)
-> Seq Scan on tbl_punch p (cost=0.00..2686.69 rows=947 width=346)
Filter: (user_id = 5087)