code: def etalon_search_keys():
      return [("phone_num", "rep_date")]
  
file_path: upgini/tests/test_binary_dataset.py
imports: import os
  import pandas
  import pytest
  from upgini import Dataset, FileColumnMeaningType
  from upgini.metadata import ModelTaskType
  from upgini.utils.datetime_utils import DateTimeSearchKeyConverter
label_desc: Use image node_id 2 for calling a global function with example usage: etalon_search_keys() and returns: list