QUERY PLAN
Sort (cost=2575.22..2577.72 rows=1000 width=362)
Sort Key: (date(tt.dt))
-> HashAggregate (cost=2507.89..2525.39 rows=1000 width=362)
Group Key: tt.dt, p.day_at, p.user_id
-> Hash Left Join (cost=2487.64..2500.39 rows=1000 width=346)
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=2469.46..2469.46 rows=1453 width=338)
-> Seq Scan on tbl_punch p (cost=0.00..2469.46 rows=1453 width=338)
Filter: (user_id = 5250)