Github user mshtelma commented on the issue:
https://github.com/apache/spark/pull/21052
Regarding the devision by zero in EstimationUtils.scala#L166, I was not
able to reproduce it here.
(https://github.com/apache/spark/blob/5cfd5fabcdbd77a806b98a6dd59b02772d2f6dee/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/EstimationUtils.scala#L166)
I can add check there too, in order to be really sure, that this never
happens.
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