code: def unique_union_id(val):
      return val.alternative_name
  
file_path: cudf/python/cudf/benchmarks/conftest.py
imports: import os
  import string
  import sys
  import pytest_cases
  from config import cudf
  from utils import OrderedSet, collapse_fixtures, column_generators, make_fixture
  from config import NUM_COLS, NUM_ROWS, collect_ignore, pytest_collection_modifyitems, pytest_sessionfinish, pytest_sessionstart
label_desc: Use image node_id 2 for calling a global function with example usage: unique_union_id(val) and returns: val