Github user navis commented on the pull request:
https://github.com/apache/spark/pull/9107#issuecomment-150998671
@chenghao-intel It will not happen with `columnar` format which just calls
`String.valueOf(field)` whatever the field is. But in row-based set which was
used older version of hive-jdbc, it casts decimal type to HiveDecimal first
which makes exception described.
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