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https://issues.apache.org/jira/browse/SPARK-3683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187537#comment-14187537
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Michael Armbrust commented on SPARK-3683:
-----------------------------------------

[~davies] there used to be some explicit code that checked for "NULL", but I 
can't find it anymore, so you are right this problem might exist in scala too.  
However, I can't reproduce it as most serdes seem to store null as "\N".  Some 
sample code to reproduce the issue would be helpful.

> PySpark Hive query generates "NULL" instead of None
> ---------------------------------------------------
>
>                 Key: SPARK-3683
>                 URL: https://issues.apache.org/jira/browse/SPARK-3683
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark, SQL
>    Affects Versions: 1.1.0
>            Reporter: Tamas Jambor
>            Assignee: Davies Liu
>
> When I run a Hive query in Spark SQL, I get the new Row object, where it does 
> not convert Hive NULL into Python None instead it keeps it string 'NULL'. 
> It's only an issue with String type, works with other types.



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