xiedeyantu commented on issue #21310:
URL: https://github.com/apache/datafusion/issues/21310#issuecomment-4174297032

   @comphead Thanks for reviewing this issue. I believe this change can help 
reduce scan I/O. Although it may not significantly reduce the end-to-end query 
time (since the sub-clauses of the UNION can be processed in parallel), it 
should still bring some benefits. If you're interested in this PR, I'd really 
appreciate it if you could take a look.


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