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https://issues.apache.org/jira/browse/FLINK-17337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17708727#comment-17708727
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Alexander Smirnov edited comment on FLINK-17337 at 6/22/23 9:42 AM:
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Hi [~jark]! I've found a
[bug|https://issues.apache.org/jira/browse/FLINK-31729] with the current logic
of LEFT/RIGHT/FULL OUTER JOIN (sometimes UPDATE_BEFORE can still be emitted). I
decided to implement ticket FLINK-17337 right away, because with this
optimization done, bug won't be present anymore. I've created a
[PR|https://github.com/apache/flink/pull/22351]. Can you take a look at it,
please?
was (Author: JIRAUSER288574):
Hi [~jark]! I've found a bug with the current logic of LEFT/RIGHT/FULL OUTER
JOIN (sometimes UPDATE_BEFORE can still be emitted). I decided to implement
ticket FLINK-17337 right away, because with this optimization done, bug won't
be present anymore. I've created a
[PR|https://github.com/apache/flink/pull/22351]. Can you take a look at it,
please?
> Send UPDATE messages instead of INSERT and DELETE in streaming join operator
> ----------------------------------------------------------------------------
>
> Key: FLINK-17337
> URL: https://issues.apache.org/jira/browse/FLINK-17337
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Runtime
> Reporter: Jark Wu
> Priority: Minor
> Labels: auto-deprioritized-major, pull-request-available
> Fix For: 1.18.0
>
>
> Currently, streaming join operator always send INSERT and DELETE messages for
> simplification if it's not inner join. However, we can send UPDATE_BEFORE and
> UPDATE_AFTER messages instead of INSERT and DELETE. For example, when we
> recieve right record "b", then we can send {{UB[a, null]}} and {{UA[a,b]}}
> instead of {{D[a,null]}}, {{I[a,b]}}. This is an optimization, because UB can
> be omitted in some cases to reduce IO cost and computation.
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