Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8026#issuecomment-149598558
@JoshRosen I've updated the unit test also by adding an `Append` operation,
without this PR, it will throws exception as I described in the jira
(https://issues.apache.org/jira/browse/SPARK-9735).
The root reason that the previous unit test can even passed, should be
solved #8035, as it will always get the latest schema from the user specified
without calling the `relation.refresh()`, however `relation.refresh()` will be
called indirectly in `Append` mode.
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