[ https://issues.apache.org/jira/browse/SPARK-9744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662233#comment-14662233 ]
Sean Owen commented on SPARK-9744: ---------------------------------- Yeah that's the idea. It works though is potentially slow. There are a few things you could do to make it more efficient. I think the mapPartitions idea is the way to go, by far -- assuming you are OK with missing windows across partition boundaries. Why just the Java RDD? > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org