Github user viirya commented on the issue:
    @davies Thanks for comment.
    In our initial benchmark of the TPC-DS queries (totally 13) using CTE, this 
PR helps about half (6) of them, 5 queries are not affected, 2 queries are 
regressed. I might say it would help CTE queries at most cases according to the 
    I agree that 500+ LOC changes looks a bit big for this improvement. I would 
like to refactor and tailor part of the changes and break it down to small 
pieces for you to review. I wish I can reduce the LOC changes at the end.
    I would like to run Q64 by disabling the push down, may I ask the purpose 
for it?

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