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https://issues.apache.org/jira/browse/FLINK-8428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458595#comment-16458595
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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_r184993658
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamJoin.scala
---
@@ -60,6 +60,9 @@ class DataStreamJoin(
override def needsUpdatesAsRetraction: Boolean = true
+ // outer join will generate retractions
+ override def producesRetractions: Boolean = joinType != JoinRelType.INNER
--- End diff --
Inner join doesn't produce retractions, left/right/full join does, for
example, left join will retract the previous non-matched output when new
matched row comes from the right side.
> 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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