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[SPARK-21057][ML] Do not use a PascalDistribution in countApprox
## What changes were proposed in this pull request? Use Poisson analysis for approx count in all cases. ## How was this patch tested? Existing tests. Author: Sean Owen <sowen@cloudera.com> Closes #18276 from srowen/SPARK-21057.
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- core/src/main/scala/org/apache/spark/partial/CountEvaluator.scala 6 additions, 17 deletions.../main/scala/org/apache/spark/partial/CountEvaluator.scala
- core/src/test/scala/org/apache/spark/partial/CountEvaluatorSuite.scala 6 additions, 6 deletions.../scala/org/apache/spark/partial/CountEvaluatorSuite.scala
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