Merge two TDigests throws NullPointerException

[kevindai0126]

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)

[tdunning]

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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