Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21305
I don't think we need (or want) `SaveMode` passed to writers after
standardizing. Uses of `WriteSupport` will always append data to an existing
table, which makes it simpler for writers. And it will be used for all writes.
A couple other notes:
* We will also need a `StagedTable` variant of `DeleteSupport` to support
`ReplaceData` as an atomic operation, but I want to get the non-atomic variants
in first; hopefully for 2.4.0.
* RTAS would use `dropTable` and not `DeleteSupport`, since it is at the
table level.
* We may still use `SaveMode` in the DF writer API, which is still under
discussion.
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