code: def time_make_union(self, fill_value):
      self.arr1.sp_index.make_union(self.arr2.sp_index)
  
imports: import numpy
  import scipy.sparse
  import pandas
  from pandas import MultiIndex, Series, date_range
  from pandas.arrays import SparseArray
  from .pandas_vb_common import setup
label_desc: Use image node_id 3 for calling the ArithmeticBlock obj's underlying member method code with example usage: obj.time_make_union(fill_value) without return types