Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/7248#issuecomment-119036207
@marmbrus Through the discussion of #5395, I think it is hard to support
java List<> types in SparkSQL because of type erasure. ISTM that if udf
developers use this type, they'd be better to use GenericUDF interfaces instead
of UDF ones. So, I re-created a PR to throw a meaningful exception when this
kind of types used.
Any thought?
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