code: def test_join_primitives_default_on():
      assert Join(values=[1, "a", False, 1.1]).expr == {
          "Std:Join": {
              "On": "",
              "Values": [1, "a", False, 1.1],
          },
      }
  
file_path: sagemaker-python-sdk/tests/unit/sagemaker/workflow/test_functions.py
imports: from __future__ import absolute_import
  import pytest
  from sagemaker.workflow.execution_variables import ExecutionVariables
  from sagemaker.workflow.functions import Join, JsonGet
  from sagemaker.workflow.parameters import ParameterFloat, ParameterInteger, ParameterString
  from sagemaker.workflow.properties import Properties, PropertyFile
label_desc: Use image node_id 1 for calling a global function with example usage: test_join_primitives_default_on() without return types