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https://issues.apache.org/jira/browse/SPARK-9744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679857#comment-14679857
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Sean Owen commented on SPARK-9744:
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join returns something different than cogroup. It returns all the combinations
of (W1,W2) not iterables over the values individually.
Here's how to make a PR:
https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark
But yes if there is suitable functionality in DataFrames, try it again and/or
look at fixing it if there is a problem.
> Add RDD method to map with lag and lead
> ---------------------------------------
>
> Key: SPARK-9744
> URL: https://issues.apache.org/jira/browse/SPARK-9744
> Project: Spark
> Issue Type: Wish
> Components: Spark Core
> Reporter: Jerry Z
> Priority: Minor
>
> To avoid zipping with index and doing numerous mapping and joins, having a
> single method call to map with an additional two parameters (1: list of
> offsets [(-) for lag, 0 for current and (+) for lead])) and (2:default
> value). The other difference to the map function takes an argument of List<T>
> and not just T.
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