[jira] [Updated] (SPARK-32863) Full outer stream-stream join

["Jungtaek Lim (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-32863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jungtaek Lim updated SPARK-32863:
---------------------------------
    Priority: Major  (was: Trivial)

> Full outer stream-stream join
> -----------------------------
>
>                 Key: SPARK-32863
>                 URL: https://issues.apache.org/jira/browse/SPARK-32863
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Structured Streaming
>    Affects Versions: 3.1.0
>            Reporter: Cheng Su
>            Priority: Major
>
> Current stream-stream join supports inner, left outer and right outer join ([https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinExec.scala#L166] ). With current design of stream-stream join (which marks whether the row is matched or not in state store), it would be very easy to support full outer join as well.
>  
> Full outer stream-stream join will work as followed:
> (1).for left side input row, check if there's a match on right side state store. If there's a match, output all matched rows. Put the row in left side state store.
> (2).for right side input row, check if there's a match on left side state store. If there's a match, output all matched rows and update left side rows state with "matched" field to set to true. Put the right side row in right side state store.
> (3).for left side row needs to be evicted from state store, output the row if "matched" field is false.
> (4).for right side row needs to be evicted from state store, output the row if "matched" field is false.



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