rdettai commented on issue #868:
URL: 
https://github.com/apache/arrow-datafusion/issues/868#issuecomment-909355408


   In #962 I am considering the possibility to make the statistics part of the 
`ExecutionPlan` trait (and remove them from `TableProvider`). But I think that 
not all nodes will have a cached version of the statistics, only those nodes 
for which it is an expensive operation to fetch them and that know that the 
they will not change.
   
   We will probably not need the statistics on the executor, because I doubt 
that any re-optimization will take place there. So it might be an optimization 
further down the road to optionally leave them out of the serialization in that 
case.


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