Github user WeichenXu123 commented on the issue:

    https://github.com/apache/spark/pull/14950
  
    @srowen not only cpu cost, if data dimension is big, serialization cost 
will be big, such as https://github.com/apache/spark/pull/14109
    and compute all target seems not proper if we may add more summary targets 
in the future ? 


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