Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/22193
@HyukjinKwon, those changes probably don't need to be in this PR, but this
is just a demonstration that we can remove `SaveMode` without changing test
cases. The larger issue is that this doesn't correctly use CTAS or RTAS plans.
Instead, it does things like directly deleting data.
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