Github user daniel-siegmann-aol commented on the pull request:

    https://github.com/apache/spark/pull/12761#issuecomment-215536649
  
    Binary compatibility check failed:
    method this()Unit in class 
org.apache.spark.mllib.stat.MultivariateOnlineSummarizer does not have a 
correspondent in current version
    
    This is expected. There was no constructor defined on that class originally 
(there were no parameters) and I added one. There is a default value, so it is 
source compatible (all existing code compiles without changes).
    
    Is there anything to be done about this? I don't believe this functionality 
can be cleanly implemented without this change. The only alternative I can 
think of is to make a copy of `MultivariateOnlineSummarizer`, which would 
involve duplicating a lot of code - obviously undesirable.


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