[jira] [Created] (SPARK-3430) Introduce ValueIncrementableHashMapAccumulator to compute Histogram

["Suraj Satishkumar Sheth (JIRA)" <ji...@apache.org>]

Suraj Satishkumar Sheth created SPARK-3430:
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             Summary: Introduce ValueIncrementableHashMapAccumulator to compute Histogram
                 Key: SPARK-3430
                 URL: https://issues.apache.org/jira/browse/SPARK-3430
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
            Reporter: Suraj Satishkumar Sheth
            Priority: Minor


Currently, we don't have a Hash map which can be used as an accumulator to produce Histogram or distribution. This class will provide a customized HashMap implemetation whose value can be incremented.
e.g. map+=(a,1), map+=(a,6) will lead to (a,7)
This can have various applications like computation of Histograms, Sampling Strategy generation, Statistical metric computation, in MLLib, etc.



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