Github user zhichao-li commented on the pull request:
https://github.com/apache/spark/pull/10753#issuecomment-188582658
@chenghao-intel , mysql(5.5) doesn't support nested data type for now, and
hive(1.2.1) doesn't support the usage of "db.table.field" in projection list at
the moment. I guess most of the user work around this by using alias.
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