Tim Chan created SPARK-17423:
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             Summary: Support IGNORE NULLS option in Window functions
                 Key: SPARK-17423
                 URL: https://issues.apache.org/jira/browse/SPARK-17423
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Tim Chan
            Priority: Minor


http://stackoverflow.com/questions/24338119/is-it-possible-to-ignore-null-values-when-using-lag-and-lead-functions-in-sq





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