QUERY PLAN
Sort (cost=2795.58..2798.08 rows=1000 width=370)
Sort Key: (date(tt.dt))
-> HashAggregate (cost=2728.26..2745.76 rows=1000 width=370)
Group Key: tt.dt, p.day_at, p.user_id
-> Hash Left Join (cost=2708.01..2720.76 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=1704 width=346)
-> Seq Scan on tbl_punch p (cost=0.00..2686.69 rows=1704 width=346)
Filter: (user_id = 5252)