code: def test_varargs_function_validation(varargs_func_fixture):
      _, func_name = varargs_func_fixture
  
      error_msg = (
          r"VarArgs function 'z=ax\+by\+c' needs at least 2 arguments"
      )
  
      with pytest.raises(ValueError, match=error_msg):
          pc.call_function(func_name, [42])
  
imports: import pytest
  import numpy
  import pyarrow
  from pyarrow import compute
label_desc: Use image node_id 22 for calling a global function with example usage: test_varargs_function_validation(varargs_func_fixture) without return types