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https://issues.apache.org/jira/browse/FLINK-6094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121729#comment-16121729
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ASF GitHub Bot commented on FLINK-6094:
---------------------------------------

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

    https://github.com/apache/flink/pull/4471#discussion_r132227802
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/util/UpdatingPlanChecker.scala
 ---
    @@ -37,8 +37,11 @@ object UpdatingPlanChecker {
       /** Extracts the unique keys of the table produced by the plan. */
       def getUniqueKeyFields(plan: RelNode): Option[Array[String]] = {
         val keyExtractor = new UniqueKeyExtractor
    -    keyExtractor.go(plan)
    -    keyExtractor.keys
    +    if (!keyExtractor.visit(plan).isDefined) {
    --- End diff --
    
    Can be replaced by `keyExtractor.visit(plan).map(_.map(_._1).toArray)`


> Implement stream-stream proctime non-window  inner join
> -------------------------------------------------------
>
>                 Key: FLINK-6094
>                 URL: https://issues.apache.org/jira/browse/FLINK-6094
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Shaoxuan Wang
>            Assignee: Hequn Cheng
>
> This includes:
> 1.Implement stream-stream proctime non-window  inner join
> 2.Implement the retract process logic for join



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