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[SPARK-32301][PYTHON][TESTS] Add a test case for toPandas to work with empty partitioned Spark DataFrame #29099

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[SPARK-32301][PYTHON][TESTS] Add a test case for toPandas to work with empty partitioned Spark DataFrame #29099

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7 changes: 7 additions & 0 deletions python/pyspark/sql/tests/test_arrow.py
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Original file line number Diff line number Diff line change
Expand Up @@ -447,6 +447,13 @@ def test_createDataFrame_with_float_index(self):
self.spark.createDataFrame(
pd.DataFrame({'a': [1, 2, 3]}, index=[2., 3., 4.])).distinct().count(), 3)

def test_no_partition_toPandas(self):
# SPARK-32301: toPandas should work from a Spark DataFrame with no partitions
# Forward-ported from SPARK-32300.
pdf = self.spark.sparkContext.emptyRDD().toDF("col1 int").toPandas()
self.assertEqual(len(pdf), 0)
self.assertEqual(list(pdf.columns), ["col1"])


@unittest.skipIf(
not have_pandas or not have_pyarrow,
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