zhengruifeng opened a new pull request #32124:
URL: https://github.com/apache/spark/pull/32124


   ### What changes were proposed in this pull request?
   1, remove existing agg, and use a new agg supporting virtual centering
   2, add related testsuites
   
   
   ### Why are the changes needed?
   centering vectors should accelerate convergence, and generate solution more 
close to R
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   
   ### How was this patch tested?
   updated testsuites and added testsuites


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