code: @Nullable
    Object convertField(Group g, String fieldName)
    {
      return convertField(g, fieldName, binaryAsString);
    }
docs: Convert a parquet group field as though it were a map. Logical types of 'list' and 'map' will be transformed
  into java lists and maps respectively ({@link ParquetGroupConverter#convertLogicalList} and
  {@link ParquetGroupConverter#convertLogicalMap}), repeated fields will also be translated to lists, and
  primitive types will be extracted into an ingestion friendly state (e.g. 'int' and 'long'). Finally,
  if a field is not present, this method will return null.