Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17000
Is the speedup coming mostly from the `MultivariateOnlineSummarizer` stage?
See https://issues.apache.org/jira/browse/SPARK-19634 which is for porting
this operation to use DataFrame UDAF and for computing only the required
metrics (instead of forcing computing all as is done currently). I wonder how
that will compare?
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