zhengruifeng opened a new pull request #32350:
URL: https://github.com/apache/spark/pull/32350


   ### What changes were proposed in this pull request?
   when `numSlices` is avaiable, `logical.Range` should compute a exact 
`maxRowsPerPartition`
   
   
   ### Why are the changes needed?
   `maxRowsPerPartition` is used in optimizer, we should provide an exact value 
if possible
   
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   existing testsuites
   


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