Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14086
I suppose my key question is still: do we need to make the user choose at
all? it seems like TRUNCATE is always the right choice except when schema
changes. That means, ideally, no new SaveMode. Overwrite would just cause
TRUNCATE where possible, otherwise DROP/CREATE.
I think this is specific to JDBC only. Other sources can leave their
behavior unchanged.
Yes, I think the next question is, how hard is it to reliably detect that
the schema hasn't changed? you know better than I, likely.
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