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https://issues.apache.org/jira/browse/SPARK-25096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-25096.
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Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 22086
[https://github.com/apache/spark/pull/22086]
> Loosen nullability if the cast is force-nullable.
> -------------------------------------------------
>
> Key: SPARK-25096
> URL: https://issues.apache.org/jira/browse/SPARK-25096
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Takuya Ueshin
> Assignee: Takuya Ueshin
> Priority: Major
> Fix For: 2.4.0
>
>
> In type coercion for complex types, if the found type is force-nullable to
> cast, we should loosen the nullability to be able to cast. Also for map key
> type, we can't use the type.
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