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https://issues.apache.org/jira/browse/SPARK-9744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662188#comment-14662188
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Jerry Z commented on SPARK-9744:
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Let me know if I'm missing/doing more work than necessary.
1. zip with index
1.5. flip pair so the key is the index
2. map with -1 to the index
3. repeat this process with however many back I need
4. join RDD pairs (resulting in a chain of pairs, which is annoying with how
long the line becomes when filling in the text between the<>)
5. another map function doing the operation you wanted to do with those values
> Add Java 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
> 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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