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https://issues.apache.org/jira/browse/SPARK-17895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15572726#comment-15572726
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Weiluo Ren commented on SPARK-17895:
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[~junyangq] Could you please help fix the SparkR doc accordingly?
> Improve documentation of "rowsBetween" and "rangeBetween"
> ---------------------------------------------------------
>
> Key: SPARK-17895
> URL: https://issues.apache.org/jira/browse/SPARK-17895
> Project: Spark
> Issue Type: Documentation
> Components: PySpark, SparkR, SQL
> Reporter: Weiluo Ren
> Priority: Minor
>
> This is an issue found by [~junyangq] when he was fixing SparkR docs.
> In WindowSpec we have two methods "rangeBetween" and "rowsBetween" (See
> [https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala#L82]).
> However, the description of "rangeBetween" does not clearly differentiate it
> from "rowsBetween". Even though in
> [https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala#L109]
> we have pretty nice description for "RangeFrame" and "RowFrame" which are
> used in "rangeBetween" and "rowsBetween", I cannot find them in the online
> Spark scala api.
> We could add small examples to the description of "rangeBetween" and
> "rowsBetween" like
> {code}
> val df = Seq(1,1,2).toDF("id")
> df.withColumn("sum", sum('id) over Window.orderBy('id).rangeBetween(0,1)).show
> /**
> * It shows
> * +---+---+
> * | id|sum|
> * +---+---+
> * | 1| 4|
> * | 1| 4|
> * | 2| 2|
> * +---+---+
> */
> df.withColumn("sum", sum('id) over Window.orderBy('id).rowsBetween(0,1)).show
> /**
> * It shows
> * +---+---+
> * | id|sum|
> * +---+---+
> * | 1| 2|
> * | 1| 3|
> * | 2| 2|
> * +---+---+
> */
> {code}
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