Nicolas Renkamp created SPARK-30961:
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Summary: Arrow enabled: to_pandas with date column fails
Key: SPARK-30961
URL: https://issues.apache.org/jira/browse/SPARK-30961
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 2.4.5
Environment: Apache Spark 2.4.5
Reporter: Nicolas Renkamp
Hi,
there seems to be a bug in the arrow enabled to_pandas conversion from spark
dataframe to pandas dataframe when the dataframe has a column of type DateType.
Here is a minimal example to reproduce the issue:
{code:java}
spark = SparkSession.builder.getOrCreate()
is_arrow_enabled = spark.conf.get("spark.sql.execution.arrow.enabled")
print("Arrow optimization is enabled: " + is_arrow_enabled)
spark_df = spark.createDataFrame(
[['2019-12-06']], 'created_at: string') \
.withColumn('created_at', F.to_date('created_at'))
# works
spark_df.toPandas()
spark.conf.set("spark.sql.execution.arrow.enabled", 'true')
is_arrow_enabled = spark.conf.get("spark.sql.execution.arrow.enabled")
print("Arrow optimization is enabled: " + is_arrow_enabled)
# raises AttributeError
spark_df.toPandas(){code}
A fix would be to modify the _check_series_convert_date function in
pyspark.sql.types to:
{code:java}
def _check_series_convert_date(series, data_type):
"""
Cast the series to datetime.date if it's a date type, otherwise returns the
original series. :param series: pandas.Series
:param data_type: a Spark data type for the series
"""
from pyspark.sql.utils import require_minimum_pandas_version
require_minimum_pandas_version() from pandas import to_datetime
if type(data_type) == DateType:
return to_datetime(series).dt.date
else:
return series
{code}
Let me know if I should prepare a Pull Request for the 2.4.5 branch.
I have not tested the behavior on master branch.
Thanks,
Nicolas
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