Genmao Yu created SPARK-19800:
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             Summary: Implement one kind of streaming sampling - reservoir 
sampling
                 Key: SPARK-19800
                 URL: https://issues.apache.org/jira/browse/SPARK-19800
             Project: Spark
          Issue Type: Improvement
          Components: Structured Streaming
    Affects Versions: 2.1.0, 2.0.2
            Reporter: Genmao Yu






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