Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15868
LGTM. Maybe @srowen and @cloud-fan can double check the code.
BTW, in the code path of regular SQL, we are able to explain the
INSERT/CTAS. However, when users use the DataFrameWriter, this is not
available. Maybe, in the future, we can add another option parameter (e.g.,
`explain`) for outputting the query plan? This is a low priority issue.
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