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https://issues.apache.org/jira/browse/SPARK-28497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-28497.
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Resolution: Fixed
Fix Version/s: 3.0.0
Issue resolved by pull request 25242
[https://github.com/apache/spark/pull/25242]
> Disallow upcasting complex data types to string type
> ----------------------------------------------------
>
> Key: SPARK-28497
> URL: https://issues.apache.org/jira/browse/SPARK-28497
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Gengliang Wang
> Assignee: Gengliang Wang
> Priority: Minor
> Fix For: 3.0.0
>
>
> In the current implementation. complex types like Array/Map/StructType are
> allowed to upcast as StringType.
> This is not safe casting. We should disallow it.
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