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https://issues.apache.org/jira/browse/SPARK-27612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16831623#comment-16831623
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Hyukjin Kwon commented on SPARK-27612:
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Argh, this happens after we upgraded the cloudpickle to 0.6.2
https://github.com/apache/spark/commit/75ea89ad94ca76646e4697cf98c78d14c6e2695f#diff-19fd865e0dd0d7e6b04b3b1e047dcda7
Upgrading cloudpickle to 0.8.1 still doesn't solve the problem .. I think we
should fix it in cloudpickle, I made a cloudpickle release and we port that
change into Spark.
> Creating a DataFrame in PySpark with ArrayType produces some Rows with Arrays
> of None
> -------------------------------------------------------------------------------------
>
> Key: SPARK-27612
> URL: https://issues.apache.org/jira/browse/SPARK-27612
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 3.0.0
> Reporter: Bryan Cutler
> Priority: Critical
> Labels: correctness
>
> This seems to only affect Python 3.
> When creating a DataFrame with type {{ArrayType(IntegerType(), True)}} there
> ends up being rows that are filled with None.
>
> {code:java}
> In [1]: from pyspark.sql.types import ArrayType, IntegerType
>
> In [2]: df = spark.createDataFrame([[1, 2, 3, 4]] * 100,
> ArrayType(IntegerType(), True))
> In [3]: df.distinct().collect()
>
> Out[3]: [Row(value=[None, None, None, None]), Row(value=[1, 2, 3, 4])]
> {code}
>
> From this example, it is consistently at elements 97, 98:
> {code}
> In [5]: df.collect()[-5:]
>
> Out[5]:
> [Row(value=[1, 2, 3, 4]),
> Row(value=[1, 2, 3, 4]),
> Row(value=[None, None, None, None]),
> Row(value=[None, None, None, None]),
> Row(value=[1, 2, 3, 4])]
> {code}
> This also happens with a type of {{ArrayType(ArrayType(IntegerType(), True))}}
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