Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14048
It's good to elimiante the inconsistency, but I don't think there is an
easy fix. With your patch, we can still create union queries with side effect
which will be executed eagerly. We use `Union` to implement multi-insert, so
there is no way to distinguish them at plan level, except we do some
fundamental changes.
As this is a small issue, I don't think it worth a lof of effort to fix it.
How about we close this PR for now and think about a holistic fix if users
complain about it? thanks.
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