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https://issues.apache.org/jira/browse/FLINK-24054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407218#comment-17407218
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Kurt Young commented on FLINK-24054:
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The example you gave is test, whose behavior could be changed & adopted easily.
I think we need to think more with actual external systems, just like you said,
kafka sink and others.
> Let SinkUpsertMaterializer emit +U instead of only +I
> -----------------------------------------------------
>
> Key: FLINK-24054
> URL: https://issues.apache.org/jira/browse/FLINK-24054
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Blocker
> Fix For: 1.14.0
>
>
> Currently, {{SinkUpsertMaterializer}} is not able to emit +U's but will
> always emit +I's. Thus, resulting changelogs are incorrect strictly speaking
> and only valid when treating +U and +I as similar changes in downstream
> operators.
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