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https://issues.apache.org/jira/browse/FLINK-17337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539375#comment-17539375
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leesenlen commented on FLINK-17337:
-----------------------------------
What was the reason for the simplification using -D/-I instead of -U/+U at the
beginning?
> 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
> Fix For: 1.16.0
>
>
> 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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