intro t bs h
η : Type u_η
dec_η : DecidableEq η
sch : Schema
⊢ ∀ (t : Table sch) (bs : List Bool),
    List.length bs = nrows t → nrows (selectRows2 t bs) = List.length (List.removeAllEq bs [false])
η : Type u_η
dec_η : DecidableEq η
sch : Schema
t : Table sch
bs : List Bool
h : List.length bs = nrows t
⊢ nrows (selectRows2 t bs) = List.length (List.removeAllEq bs [false])