code: def weld_combine_scalars(scalars, weld_type):
      
      weld_obj = create_empty_weld_object()
      obj_ids = (get_weld_obj_id(weld_obj, scalar) for scalar in scalars)
  
      merges = '\n'.join(('let res = merge(res, {});'.format(obj_id) for obj_id in obj_ids))
  
      weld_template = """let res = appender[{type}];
  {merges}
  result(res)
  """
  
      weld_obj.weld_code = weld_template.format(type=weld_type,
                                                merges=merges)
  
      return weld_obj
docs: Combine column-wise aggregations (so resulting scalars) into a single array.
  
      Parameters
      ----------
      scalars : tuple of WeldObjects
          WeldObjects to combine.
      weld_type : WeldType
          The Weld type of the result. Currently expecting scalars to be of the same type.
  
      Returns
      -------
      WeldObject
          Representation of this computation.