jackwener opened a new issue, #4772:
URL: https://github.com/apache/arrow-datafusion/issues/4772
BTW, I'm not sure if it was a bug, but the `PushDownProjection`
doesn't push down the empty projection to the child plans of `Union` in this
example. Maybe @jackwener knows more about it.
_Originally posted by @HaoYang670 in
https://github.com/apache/arrow-datafusion/pull/4753#discussion_r1058696036_
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