diff --git a/src/rows.jl b/src/rows.jl
index 77e84d27..a008f1fd 100644
--- a/src/rows.jl
+++ b/src/rows.jl
@@ -2,7 +2,7 @@
 # no automatic type inference is done, but types are allowed to be passed
 # for as many columns as desired; `CSV.detect(row, i)` can also be used to
 # use the same inference logic used in `CSV.File` for determing a cell's typed value
-struct Rows{transpose, O, IO, T}
+struct Rows{transpose, O, IO, T, F}
     name::String
     names::Vector{Symbol} # only includes "select"ed columns
     finaltypes::Vector{Type} # only includes "select"ed columns
@@ -22,6 +22,8 @@ struct Rows{transpose, O, IO, T}
     positions::Vector{Int64}
     reusebuffer::Bool
     tapes::Vector{AbstractVector}
+    filter::F
+    codes::Vector{Int16}
     lookup::Dict{Symbol, Int}
 end
 
@@ -99,6 +101,7 @@ function Rows(source;
     ignoreemptylines::Bool=false,
     select=nothing,
     drop=nothing,
+    filter=nothing,
     # parsing options
     missingstrings=String[],
     missingstring="",
@@ -135,7 +138,8 @@ function Rows(source;
     deleteat!(finaltypes, h.todrop)
     deleteat!(columnmap, h.todrop)
     lookup = Dict(nm=>i for (i, nm) in enumerate(h.names))
-    return Rows{transpose, typeof(h.options), typeof(h.buf), typeof(h.customtypes)}(
+    codes = filter === nothing ? EMPTY_CODES : zeros(Int16, h.cols)
+    return Rows{transpose, typeof(h.options), typeof(h.buf), typeof(h.customtypes), typeof(filter)}(
         h.name,
         h.names,
         finaltypes,
@@ -155,6 +159,8 @@ function Rows(source;
         h.positions,
         reusebuffer,
         tapes,
+        filter,
+        codes,
         lookup,
     )
 end
@@ -172,7 +178,7 @@ const EMPTY_REFS = RefPool[]
     (pos > len || row > r.limit) && return nothing
     pos > len && return nothing
     tapes = r.reusebuffer ? r.tapes : allocate(1, r.cols, r.types, r.flags)
-    pos = parserow(1, Val(transpose), r.cols, EMPTY_TYPEMAP, tapes, r.datapos, r.buf, pos, len, r.positions, 0.0, EMPTY_REFS, 1, r.datarow + row - 2, r.types, r.flags, false, r.options, r.coloptions, r.customtypes)
+    pos = parserow(1, Val(transpose), r.cols, EMPTY_TYPEMAP, tapes, r.datapos, r.buf, pos, len, r.positions, 0.0, EMPTY_REFS, 1, r.datarow + row - 2, r.types, r.flags, r.filter, r.names, r.codes, false, r.options, r.coloptions, r.customtypes)
     return Row2(r.names, r.finaltypes, r.columnmap, r.types, r.lookup, tapes, r.buf, r.e, r.options, r.coloptions), (pos, len, row + 1)
 end