[GitHub] flink pull request #5327: [FLINK-8428] [table] Implement stream-stream non-w...

[twalthr]

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5327#discussion_r182407417
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamRel.scala
 ---
    @@ -53,4 +53,8 @@ trait DataStreamRel extends FlinkRelNode {
         */
       def consumesRetractions: Boolean = false
     
    +  /**
    +    * Whether the [[DataStreamRel]] produces retraction messages.
    +    */
    +  def producesRetractions: Boolean = false
    --- End diff --
    
    Why isn't `producesUpdates` enough?


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