code: def make_agg(self, mapping, precomputed, scales):
      grouping_variables = {
          aes_key: mapping[aes_key]
          for aes_key in mapping.keys()
          if should_use_scale_for_grouping(scales[aes_key])
      }
      non_grouping_variables = {
          aes_key: mapping[aes_key]
          for aes_key in mapping.keys()
          if aes_key not in grouping_variables
      }
      return hl.agg.group_by(
          hl.struct(**grouping_variables),
          hl.agg.collect(hl.struct(**non_grouping_variables)),
      )
  
imports: from typing import List
  import abc
  from pandas import DataFrame
  import pandas
  import hail
  from hail.utils.java import warning
  from .utils import should_use_scale_for_grouping
label_desc: Use image node_id 1 for calling the StatIdentity obj's underlying member method code with example usage: obj.make_agg(mapping, precomputed, scales) and returns: hl