Don't fail if column in an option doesn't exist

Author: Shashi Gowda

src/csv.jl

@@ -22,7 +22,14 @@ function optionsiter(opts::Associative, header)
     isempty(header) && return opts
     iter = Dict{Int,Any}()
     for (k, v) in opts
-        iter[getbyheader(1:length(header), header, k)] = v
+        i = try
+            getbyheader(1:length(header), header, k)
+        catch err
+            if isa(err, ArgumentError)
+                continue
+            end
+        end
+        iter[i] = v
     end
     iter
 end

test/runtests.jl

@@ -410,6 +410,9 @@ import TextParse: _csvread
                     DataValue{Int64}[nothing, nothing, nothing, 2, 1]), String["x", "y", "z"], [2, 3]))
     @test isequal(csvread(["data/a.csv", "data/b.csv"], samecols=[("y","z")]),
                   (([1.0, 2.0, 1.0, 2.0, 3.0], DataValue{Int64}[2, 2, nothing, 2, 1]), String["x", "y"], [2,3]))
+
+    # shouldn't fail because y doesn't exist
+    @test _csvread("x\n1", colparsers=Dict("y"=>String)) == (([1],), ["x"])
 end
 
 @testset "skiplines_begin" begin