mattsu2020 commented on PR #26775:
URL: https://github.com/apache/datafusion/pull/26775#issuecomment-6509654562
I understand your concerns and apologize for not clearly explaining my
design decisions.
My goal was to improve join estimation accuracy using exact NDVs, but I
recognize the collection cost. I will also evaluate whether approximate NDVs
can provide a better balance between accuracy and performance.
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