Hyukjin Kwon resolved SPARK-23861.
       Resolution: Fixed
    Fix Version/s: 2.4.0

Issue resolved by pull request 20978

> Clarify behavior of default window frame boundaries with and without orderBy 
> clause
> -----------------------------------------------------------------------------------
>                 Key: SPARK-23861
>                 URL: https://issues.apache.org/jira/browse/SPARK-23861
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Li Jin
>            Assignee: Li Jin
>            Priority: Minor
>             Fix For: 2.4.0
> Without an orderBy clause, the default window frame boundary is (rowFrame, 
> unbounded, unbouned). With an orderBy clause, the default window frame 
> boundary is (rangeFrame, unbouned, currentRow). This behavior is by design 
> but is a bit intuitive to people that are not very familiar with SQL window 
> semantics. Let's update the API doc to clarify that.

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