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https://issues.apache.org/jira/browse/SPARK-9744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679879#comment-14679879
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Jerry Z commented on SPARK-9744:
--------------------------------
What's PR short for??? I may have misunderstood things. Also if you have a
moment... mind letting me know if you can create a test data frame and
successfully execute an sql query from the data frame with lag(COLUMN_NAME).
Any advise on debugging those two culprits (being unable to use class
reflection to create a data frame and why lag can't be recognised as a query
statement)?
> 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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