gengliangwang opened a new pull request #25242: [SPARK-28497][SQL] Disallow upcasting complex data types to string type URL: https://github.com/apache/spark/pull/25242 ## What changes were proposed in this pull request? 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. ## How was this patch tested? Update the existing test case
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