code: def extract_values(col_name, tuples):
      return [t[col_name] for t in tuples]
  
file_path: ray/python/ray/data/tests/util.py
imports: import functools
  import os
  import tempfile
  from contextlib import contextmanager
  import ray
  from ray.data._internal.execution.interfaces.physical_operator import DataOpTask, MetadataOpTask, PhysicalOperator
label_desc: Use image node_id 5 for calling a global function with example usage: extract_values(col_name, tuples) and returns: unknown