Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16401
> Then we need to modify all the existing implementation of statistics and
do if(cboEnabled) test in each of them. That would be tedious.
hm? I think we only need to do `if(cboEnabled)` for a few operators that
will estimate statistics, e.g. Filter, Aggregate, Join, etc.
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