code: def test_with_key_complex(self):
      def left_assign_key(key, lft, _):
          return lft.assign(key=key[0])
  
      result = (
          self.data1.groupby(col("id") % 2 == 0)
          .cogroup(self.data2.groupby(col("id") % 2 == 0))
          .applyInPandas(
              left_assign_key, "id long, k int, v int, key boolean"
          )
          .sort(["id", "k"])
          .toPandas()
      )
  
      expected = self.data1.toPandas()
      expected = expected.assign(key=expected.id % 2 == 0)
  
      assert_frame_equal(expected, result)
  
imports: import unittest
  from typing import cast
  from pyspark.sql.functions import array, explode, col, lit, udf, pandas_udf, sum
  from pyspark.sql.types import ArrayType, DoubleType, LongType, StructType, StructField, YearMonthIntervalType, Row
  from pyspark.sql.window import Window
  from pyspark.errors import IllegalArgumentException, PythonException
  from pyspark.testing.sqlutils import ReusedSQLTestCase, have_pandas, have_pyarrow, pandas_requirement_message, pyarrow_requirement_message
  from pyspark.testing.utils import QuietTest
label_desc: Use image node_id 29 for calling the CogroupedApplyInPandasTestsMixin obj's underlying member method code with example usage: obj.test_with_key_complex() and returns: lft