Zhu, Lipeng created SPARK-27951:
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             Summary: Built-in function: NTH_VALUE
                 Key: SPARK-27951
                 URL: https://issues.apache.org/jira/browse/SPARK-27951
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Zhu, Lipeng


|{{nth_value({{value}} {{any}}, {{nth}}{{integer}})}}|{{same type as 
}}{{value}}|returns {{value}} evaluated at the row that is the {{nth}} row of 
the window frame (counting from 1); null if no such row|



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