Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16685
I still have a concern for Update, even if we do an update based on key
values. Using this way for update statements, we are still facing
non-deterministic results. For example, you are unable to do a key update. For
non-key updates, we also face another issue when the target table has the
secondary unique index.
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