QUERY PLAN
Sort (cost=4624.46..4626.96 rows=1000 width=436)
Sort Key: (date(tt.dt)) DESC
-> Group (cost=4557.13..4574.63 rows=1000 width=436)
Group Key: tt.dt, p.day_at, p.user_id
-> Sort (cost=4557.13..4559.63 rows=1000 width=420)
Sort Key: tt.dt, p.day_at, p.user_id
-> Hash Left Join (cost=4494.55..4507.30 rows=1000 width=420)
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=4477.21..4477.21 rows=1386 width=412)
-> Seq Scan on tbl_punch p (cost=0.00..4477.21 rows=1386 width=412)
Filter: (user_id = 1001)