Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/3821#issuecomment-78571134
While I would like to fix this issue, the current solution is only masking
the problem. As I said before, `java.math.BigDecimal` should never exist
during execution. Instead of handling this in the hive udf code we should find
the place where we are failing to do the conversion on the way in.
Until then, I suggest we close this issue. If you have a test case that
causes the problem from SQL it would be great to add it to the JIRA.
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