@Override
                    public String getFieldName(int number)
                    {
                        // only called during writes
                        final Field<T> field = ms.getFieldByNumber(number);

                        return field == null ? null : field.name;
                    }
Include the fields for merging and writing.
<p>
The args param is required (the field names to include).
protostuff-runtime-view/src/main/java/io/protostuff/runtime/RuntimeView.java