code: def test_narrow_dependency_in_join(self):
      rdd = self.sc.parallelize(range(10)).map(lambda x: (x, x))
      parted = rdd.partitionBy(2)
      self.assertEqual(2, parted.union(parted).getNumPartitions())
      self.assertEqual(
          rdd.getNumPartitions() + 2,
          parted.union(rdd).getNumPartitions(),
      )
      self.assertEqual(
          rdd.getNumPartitions() + 2,
          rdd.union(parted).getNumPartitions(),
      )
  
      tracker = self.sc.statusTracker()
  
      self.sc.setJobGroup("test1", "test", True)
      d = sorted(parted.join(parted).collect())
      self.assertEqual(10, len(d))
      self.assertEqual((0, (0, 0)), d[0])
      jobId = tracker.getJobIdsForGroup("test1")[0]
      self.assertEqual(2, len(tracker.getJobInfo(jobId).stageIds))
  
      self.sc.setJobGroup("test2", "test", True)
      d = sorted(parted.join(rdd).collect())
      self.assertEqual(10, len(d))
      self.assertEqual((0, (0, 0)), d[0])
      jobId = tracker.getJobIdsForGroup("test2")[0]
      self.assertEqual(3, len(tracker.getJobInfo(jobId).stageIds))
  
      self.sc.setJobGroup("test3", "test", True)
      d = sorted(parted.cogroup(parted).collect())
      self.assertEqual(10, len(d))
      self.assertEqual([[0], [0]], list(map(list, d[0][1])))
      jobId = tracker.getJobIdsForGroup("test3")[0]
      self.assertEqual(2, len(tracker.getJobInfo(jobId).stageIds))
  
      self.sc.setJobGroup("test4", "test", True)
      d = sorted(parted.cogroup(rdd).collect())
      self.assertEqual(10, len(d))
      self.assertEqual([[0], [0]], list(map(list, d[0][1])))
      jobId = tracker.getJobIdsForGroup("test4")[0]
      self.assertEqual(3, len(tracker.getJobInfo(jobId).stageIds))
  
imports: from pyspark.testing.utils import ReusedPySparkTestCase
label_desc: Use image node_id 1 for calling the JoinTests obj's underlying member method code with example usage: obj.test_narrow_dependency_in_join() without return types