Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14086
Hm, it seems like it should be another `SaveMode` if anything. Its
semantics would be identical to `Overwrite`, I guess, for other non-JDBC
sources. CC @yhuai ?
However... is it not possible to just TRUNCATE when the schema hasn't
changed, and DROP/CREATE when it has? that seems like the best solution if it's
feasible.
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