CSharpApiGenerator doesn't assign default values to Optional<> type.

[yaeldekel]

The code generated for an argument that is defined as
string LabelColumn = "Label";

is:
///

/// Column to use for labels
///

public string LabelColumn { get; set; } = "Label";

but the code generate for an argument that is defined as
public Optional GroupColumn = Optional.Implicit("GroupId");

is:

        /// <summary>
        /// Column to use for grouping
        /// </summary>
        public Microsoft.ML.Runtime.EntryPoints.Optional<string> GroupColumn { get; set; }

[Ivanidzo4ka]

I can enable that, but as soon as I do it, bunch of test starts to fail with expected column not found. It looks like currently we don't have code which would handle absence of optional column

[shauheen]

@yaeldekel is this issue resolved?