rw [nrows, Schema.length_eq_List_length] at h
case a
η : Type u_η
dec_η : DecidableEq η
sch : Schema
t : Table sch
bs : List Bool
h : List.length bs = nrows t
⊢ List.length bs = List.length t.rows
case a
η : Type u_η
dec_η : DecidableEq η
sch : Schema
t : Table sch
bs : List Bool
h : List.length bs = List.length t.rows
⊢ List.length bs = List.length t.rows