code: def __init__(self, path: str, column: str, file_format: str):
      super().__init__(path, file_format=file_format)
  
      self.column = column
      self.file_format = file_format
  
file_path: ray/doc/source/data/doc_code/custom_datasource_example.py
imports: from typing import Iterator, Union, List
  import pyarrow
  from ray.data.block import Block
  from ray.data.datasource import FileBasedDatasource
  import ray
  from typing import Any, Dict
  import pyarrow
  from ray.data.datasource import RowBasedFileDatasink
label_desc: Use image node_id 1 to create a new ImageDatasink object from inherited base classes: RowBasedFileDatasink with example: obj = ImageDatasink(path, column, file_format)