[jira] [Reopened] (SPARK-2331) SparkContext.emptyRDD should return RDD[T] not EmptyRDD[T]

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-2331?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen reopened SPARK-2331:
------------------------------

Reopening to catch this for version 2.x

> SparkContext.emptyRDD should return RDD[T] not EmptyRDD[T]
> ----------------------------------------------------------
>
>                 Key: SPARK-2331
>                 URL: https://issues.apache.org/jira/browse/SPARK-2331
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.0.0
>            Reporter: Ian Hummel
>
> The return type for SparkContext.emptyRDD is EmptyRDD[T].
> It should be RDD[T].  That means you have to add extra type annotations on code like the below (which creates a union of RDDs over some subset of paths in a folder)
> val rdds = Seq("a", "b", "c").foldLeft[RDD[String]](sc.emptyRDD[String]) { (rdd, path) ⇒
>           rdd.union(sc.textFile(path))
>         }



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