Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16685
Thank you!
I prefer to pushing down the UPSERT workloads into the underlying DBMS, but
not all the JDBC sources support it. Thus, maybe we can provide users two
solutions at the same time. Let them choose based on their usage scenarios.
Also cc @srowen @JoshRosen
BTW, I did not carefully review the solution. It might still have some
holes.
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