code: def to_arrow(self):
      typ = self.dtype.to_arrow()
      struct_arrow = super().to_arrow()
      if len(struct_arrow) == 0:
          # struct arrow is pa.struct array with null children types
          # we need to make sure its children have non-null type
          struct_arrow = pa.array([], typ.storage_type)
      return pa.ExtensionArray.from_storage(typ, struct_arrow)
  
file_path: cudf/python/cudf/cudf/core/column/interval.py
imports: from typing import Optional
  import pandas
  import pyarrow
  import cudf
  from cudf.core.column import StructColumn
  from cudf.core.dtypes import CategoricalDtype, IntervalDtype
label_desc: Use image node_id 4 for calling the IntervalColumn obj's underlying member method code with example usage: obj.to_arrow() and returns: pa