Github user joseph-torres commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18973#discussion_r138114144
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
 ---
    @@ -443,7 +444,8 @@ case class Range(
         end: Long,
         step: Long,
         numSlices: Option[Int],
    -    output: Seq[Attribute])
    +    output: Seq[Attribute],
    +    override val isStreaming: Boolean)
    --- End diff --
    
    I don't think there's necessarily a reason it shouldn't be able to; 
streaming sources are free to define getBatch() however they'd like.
    
    Right now the only source actually doing that is a fake source in 
StreamSuite.


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