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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/07/24 08:07:39 UTC

[GitHub] [spark] gengliangwang opened a new pull request #25242: [SPARK-28497][SQL] Disallow upcasting complex data types to string type

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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