[jira] [Assigned] (SPARK-25737) Remove JavaSparkContextVarargsWorkaround and standardize union() methods

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-25737:
------------------------------------

    Assignee: Sean Owen  (was: Apache Spark)

> Remove JavaSparkContextVarargsWorkaround and standardize union() methods
> ------------------------------------------------------------------------
>
>                 Key: SPARK-25737
>                 URL: https://issues.apache.org/jira/browse/SPARK-25737
>             Project: Spark
>          Issue Type: Task
>          Components: Spark Core
>    Affects Versions: 3.0.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Minor
>
> In ancient times in 2013, JavaSparkContext got a superclass JavaSparkContextVarargsWorkaround to deal with some Scala 2.7 issue: [http://www.scala-archive.org/Workaround-for-implementing-java-varargs-in-2-7-2-final-td1944767.html#a1944772]
> I believe this was really resolved by the {{@varags}} annotation in Scala 2.9. 
> I believe we can now remove this workaround. Along the way, I think we can also avoid the duplicated definitions of {{union()}}. Where we should be able to just have one varargs method, we have up to 3 forms:
>  - {{union(RDD, Seq/List)}}
>  - {{union(RDD*)}}
>  - {{union(RDD, RDD*)}}
> While this pattern is sometimes used to avoid type collision due to erasure, I don't think it applies here.
> After cleaning it, we'll have 1 SparkContext and 3 JavaSparkContext methods (for the 3 Java RDD types), not 11 methods.
> The only difference for callers in Spark 3 would be that {{sc.union(Seq(rdd1, rdd2))}} now has to be {{sc.union(rdd1, rdd2)}} (simpler) or {{sc.union(Seq(rdd1, rdd2): _*)}}



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