Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18814#discussion_r131596386
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/expressions/Window.scala ---
    @@ -159,6 +159,17 @@ object Window {
       }
     
       /**
    +   * @param start boundary start, inclusive. The frame is unbounded if 
this evals to
    +   *              the minimum long value (`Window.unboundedPreceding`).
    --- End diff --
    
    `.. the minimum long value ...` this is not true now, we use a special 
value `functions.unboundedPreceding`


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