AngersZhuuuu opened a new pull request #26500: [SPARK-29874][SQL]Optimize 
Dataset.isEmpty()
URL: https://github.com/apache/spark/pull/26500
 
 
   ### What changes were proposed in this pull request?
   Optimize Dataset.isEmpty().
   
   
   ### Why are the changes needed?
   Optimize Dataset.isEmpty()
   
   ### Does this PR introduce any user-facing change?
   No
   
   
   ### How was this patch tested?
   Origin UT

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