apply List.sieve_removeAllEq
η : Type u_η
dec_η : DecidableEq η
sch : Schema
t : Table sch
bs : List Bool
h : List.length bs = nrows t
⊢ List.length (List.sieve bs t.rows) = List.length (List.removeAllEq bs [false])
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