code: def columnSchema(self):
          
  
          if self._columnSchema is None:
              ctx = SparkContext._active_spark_context
              jschema = ctx._jvm.org.apache.spark.ml.image.ImageSchema.columnSchema()
              self._columnSchema = _parse_datatype_json_string(jschema.json())
          return self._columnSchema
docs: Returns the schema for the image column.
  
          :return: a :class:`StructType` for image column,
              ``struct<origin:string, height:int, width:int, nChannels:int, mode:int, data:binary>``.
  
          .. versionadded:: 2.4.0