code: def num_chunks(self) -> int:
      return self._pyarrow_col.num_chunks()
  
imports: import pyarrow
  from functools import cached_property
  from typing import Sequence, Optional
  from .sql import SqlDataset
label_desc: Use image node_id 10 for calling the DatasetColumn obj's underlying member method code with example usage: obj.num_chunks() and returns: self