Merge two TDigests throws NullPointerException #100

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1. tdunning commented on Nov 20, 2015

   

   tdunning

   on Nov 20, 2015

   Contributor

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   Streamlib should use the AvlTreeDigest instead.

   Faster. Better.

   On Fri, Nov 20, 2015 at 5:46 PM, kevindai0126 notifications@github.com
   wrote:

   Sometimes when I merged two tdigests by call the add method of one
   tdigest, it threw NullPointerException as follows:
   java.lang.NullPointerException
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:85)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:79)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at
   com.clearspring.analytics.stream.quantile.GroupTree.add(GroupTree.java:81)
   at com.clearspring.analytics.stream.quantile.TDigest.add(TDigest.java:146)
   at com.clearspring.analytics.stream.quantile.TDigest.add(TDigest.java:171)

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   #100.