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https://issues.apache.org/jira/browse/SPARK-28706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-28706.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 25425
[https://github.com/apache/spark/pull/25425]
> Allow upcast from null type to any types
> ----------------------------------------
>
> Key: SPARK-28706
> URL: https://issues.apache.org/jira/browse/SPARK-28706
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Xingbo Jiang
> Assignee: Xingbo Jiang
> Priority: Minor
> Fix For: 3.0.0
>
>
> It should be safe to upcast from null type to any types.
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