Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/8800#issuecomment-141254537
Currently `saveAsTable` tries its best to save the table as Hive compatible
format, and falls back to Spark SQL specific format if it fails. I wonder
whether it's too confusing for users to reason about behavior of `saveAsTable`.
Would it be better to have a separate SQL option to force using Hive compatible
format? With this option on, users can be quite confident that if a
`saveAsTable` call succeeds, the saved table must be Hive compatible.
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