class_docstr: These test cases exercise the interface to the proto plan
  generation but do not call Spark.
class_docstr_tok: ["These","test","cases","exercise","the","interface","to","the","proto","plan","generation","but","do","not","call","Spark","."]
code: def test_coalesce_and_repartition(self):
      # SPARK-41026: test Coalesce and Repartition API in Python client.
      df = self.connect.readTable(table_name=self.tbl_name)
      plan1 = df.coalesce(10)._plan.to_proto(self.connect)
      self.assertEqual(10, plan1.root.repartition.num_partitions)
      self.assertFalse(plan1.root.repartition.shuffle)
      plan2 = df.repartition(20)._plan.to_proto(self.connect)
      self.assertTrue(plan2.root.repartition.shuffle)
  
      with self.assertRaises(PySparkValueError) as pe:
          df.coalesce(-1)._plan.to_proto(self.connect)
  
      self.check_error(
          exception=pe.exception,
          error_class="VALUE_NOT_POSITIVE",
          message_parameters={
              "arg_name": "numPartitions",
              "arg_value": "-1",
          },
      )
  
      with self.assertRaises(PySparkValueError) as pe:
          df.repartition(-1)._plan.to_proto(self.connect)
  
      self.check_error(
          exception=pe.exception,
          error_class="VALUE_NOT_POSITIVE",
          message_parameters={
              "arg_name": "numPartitions",
              "arg_value": "-1",
          },
      )
  
imports: import unittest
  import uuid
  import datetime
  import decimal
  import math
  from pyspark.testing.connectutils import PlanOnlyTestFixture, should_test_connect, connect_requirement_message
  from pyspark.errors import PySparkValueError
label_desc: Use image node_id 33 for calling the SparkConnectPlanTests obj's underlying member method code with example usage: obj.test_coalesce_and_repartition() without return types