code: def test_column_select(self):
      df = self.df
      self.assertEqual(self.testData, df.select("*").collect())
      self.assertEqual(
          self.testData, df.select(df.key, df.value).collect()
      )
      self.assertEqual(
          [Row(value="1")],
          df.where(df.key == 1).select(df.value).collect(),
      )
  
imports: from itertools import chain
  from pyspark.sql import Column, Row
  from pyspark.sql import functions
  from pyspark.sql.types import StructType, StructField, LongType
  from pyspark.errors import AnalysisException, PySparkTypeError, PySparkValueError
  from pyspark.testing.sqlutils import ReusedSQLTestCase
label_desc: Use image node_id 6 for calling the ColumnTestsMixin obj's underlying member method code with example usage: obj.test_column_select() without return types