code: def __init__(self, df: SqlDatasetDataFrame, name: str):
      self._df = df
      self._name = name
  
imports: import pyarrow
  from functools import cached_property
  from typing import Sequence, Optional
  from .sql import SqlDataset
label_desc: Use image node_id 1 to create a new DatasetColumn object  with example: obj = DatasetColumn(df, name)