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https://issues.apache.org/jira/browse/SPARK-55244?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ruifeng Zheng resolved SPARK-55244.
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Fix Version/s: 4.2.0
Resolution: Fixed
Issue resolved by pull request 54015
[https://github.com/apache/spark/pull/54015]
> Use np.nan as default for string type in pandas 3
> -------------------------------------------------
>
> Key: SPARK-55244
> URL: https://issues.apache.org/jira/browse/SPARK-55244
> Project: Spark
> Issue Type: Sub-task
> Components: PySpark
> Affects Versions: 4.2.0
> Reporter: Tian Gao
> Assignee: Tian Gao
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.2.0
>
>
> [https://pandas.pydata.org/docs/user_guide/migration-3-strings.html#the-missing-value-sentinel-is-now-always-nan]
> In pandas 3, missing value sentinel is always np.nan. We should follow this
> pattern.
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