xudong963 commented on issue #20184:
URL: https://github.com/apache/datafusion/issues/20184#issuecomment-3876964396

   I like the way. 
   
   The recomputation of children's stats is an unknown issue when I worked on 
`partition_statistics,` and the current plan for this is to cache the 
children's stats, like properties.
   
   We also compute statistics like the proposal in 
[databend](https://github.com/databendlabs/databend/blob/022c639ec2809ab00cd7bbe283bb458f34c6d655/src/query/sql/src/planner/plans/union_all.rs#L140)
 before
   
   So I think it's good to go.
   


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