[jira] [Resolved] (SPARK-28854) Zipping iterators in mapPartitions will fail

["Hyukjin Kwon (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-28854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-28854.
----------------------------------
    Resolution: Invalid

> Zipping iterators in mapPartitions will fail
> --------------------------------------------
>
>                 Key: SPARK-28854
>                 URL: https://issues.apache.org/jira/browse/SPARK-28854
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.4.3
>            Reporter: Hao Yang Ang
>            Priority: Minor
>
> {code}
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(2*).zip(xs)).collect.foreach(println)
> ...
> java.util.NoSuchElementException: next on empty iterator
> {code}
>  
>  
> Workaround - implement zip with mapping to tuple:
> {code}
> scala> sc.parallelize(Seq(1, 2, 3)).mapPartitions(xs => xs.map(x => (x * 2, x))).collect.foreach(println)
> (2,1)
> (4,2)
> (6,3)
> {code}
>  



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