Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14452
@viirya I have taken a look. It looks pretty cool what you are doing. One
question: why are you focussing on CTE's only? Shouldn't we look at any part of
the query tree?
The other thing is that we already reuse most exchanges. What does this PR
add performance wise?
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