zhengruifeng opened a new pull request #26990: [SPARK-18409][ML][FOLLOWUP] LSH 
approxNearestNeighbors optimization
URL: https://github.com/apache/spark/pull/26990
 
 
   ### What changes were proposed in this pull request?
   compute count and quantile on one pass
   
   ### Why are the changes needed?
   to avoid extra pass
   
   
   ### Does this PR introduce any user-facing change?
   No
   
   
   ### How was this patch tested?
   existing testsuites
   

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