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https://issues.apache.org/jira/browse/FLINK-8428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458593#comment-16458593
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ASF GitHub Bot commented on FLINK-8428:
---------------------------------------
Github user hequn8128 commented on a diff in the pull request:
https://github.com/apache/flink/pull/5327#discussion_r184993457
--- 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 --
A join generates retraction if it's type is left/right/full. It is
different from agg which generates retractions if
`sendsUpdatesAsRetraction(node) && node.producesUpdates` is true.
> Implement stream-stream non-window left outer join
> --------------------------------------------------
>
> Key: FLINK-8428
> URL: https://issues.apache.org/jira/browse/FLINK-8428
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
>
> Implement stream-stream non-window left outer join for sql/table-api. A
> simple design doc can be found
> [here|https://docs.google.com/document/d/1u7bJHeEBP_hFhi8Jm4oT3FqQDOm2pJDqCtq1U1WMHDo/edit?usp=sharing]
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