Gengliang Wang created SPARK-28497:
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Summary: 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
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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