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https://issues.apache.org/jira/browse/SPARK-39568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17562314#comment-17562314
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Hyukjin Kwon commented on SPARK-39568:
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[~itholic] [~XinrongM] [~podongfeng] FYI
> when using df.astype("str") on pyspark dataframe. None are converted "None"
> ---------------------------------------------------------------------------
>
> Key: SPARK-39568
> URL: https://issues.apache.org/jira/browse/SPARK-39568
> Project: Spark
> Issue Type: Improvement
> Components: Pandas API on Spark
> Affects Versions: 3.3.0
> Environment: Tried on azure databricks.
> Reporter: Gokul Yalavarti
> Priority: Major
> Attachments: chrome_M3JLsVzzb2.png,
> image-2022-06-23-18-33-42-324.png, loan200 - Copy.csv
>
>
> when using df.astype("str") on pyspark dataframe. None are converted "None".
>
> - Not able to keep Null values as None. instead it is converted to string
> "None" for whole column.
>
> https://databricks-prod-cloudfront.cloud.databricks.com/public/4027ec902e239c93eaaa8714f173bcfc/9431837223032/3368288770184753/3794760114602748/latest.html
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