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https://issues.apache.org/jira/browse/FLINK-34694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17827664#comment-17827664
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Roman Boyko commented on FLINK-34694:
-------------------------------------
After failed CI I've realized the state is changed for outer side states and
can't be restored from previously made checkpoints. Thanks to RestoreTest
functionality for checking it=)
So now I have two options here: either use the old state schema for outer side
(it would still have the same performance) or increase the version of
ExecNodeMetadata for StreamExecJoin node.
> Delete num of associations for streaming outer join
> ---------------------------------------------------
>
> Key: FLINK-34694
> URL: https://issues.apache.org/jira/browse/FLINK-34694
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Runtime
> Affects Versions: 1.16.3, 1.17.2, 1.19.0, 1.18.1
> Reporter: Roman Boyko
> Priority: Major
> Attachments: image-2024-03-15-19-51-29-282.png,
> image-2024-03-15-19-52-24-391.png
>
>
> Currently in StreamingJoinOperator (non-window) in case of OUTER JOIN the
> OuterJoinRecordStateView is used to store additional field - the number of
> associations for every record. This leads to store additional Tuple2 and
> Integer data for every record in outer state.
> This functionality is used only for sending:
> * -D[nullPaddingRecord] in case of first Accumulate record
> * +I[nullPaddingRecord] in case of last Revoke record
> The overhead of storing additional data and updating the counter for
> associations can be avoided by checking the input state for these events.
>
> The proposed solution can be found here -
> [https://github.com/rovboyko/flink/commit/1ca2f5bdfc2d44b99d180abb6a4dda123e49d423]
>
> According to the nexmark q20 test (changed to OUTER JOIN) it could increase
> the performance up to 20%:
> * Before:
> !image-2024-03-15-19-52-24-391.png!
> * After:
> !image-2024-03-15-19-51-29-282.png!
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