code: def col_object(
      self,
  ) -> Union[ColumnCatalogEntry, FunctionIOCatalogEntry]:
      return self._col_object
  
imports: from typing import Union
  from evadb.catalog.models.column_catalog import ColumnCatalogEntry
  from evadb.catalog.models.function_io_catalog import FunctionIOCatalogEntry
  from evadb.models.storage.batch import Batch
  from .abstract_expression import AbstractExpression, ExpressionReturnType, ExpressionType
label_desc: Use image node_id 5 for calling the TupleValueExpression obj's underlying member method code with example usage: obj.col_object() and returns: self