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https://issues.apache.org/jira/browse/FLINK-8545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16353838#comment-16353838
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Hequn Cheng commented on FLINK-8545:
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Hi, [~fhueske], I think you are right. For deletions on non-inserted keys, both
ordered and unordered deletions don't have to send downstream, because
\{{Table A + delete on non-inserted keys = Table A}}. And, with upsert check,
late arrived messages can be ignored too. What do you think?
> Implement upsert stream table source
> -------------------------------------
>
> Key: FLINK-8545
> URL: https://issues.apache.org/jira/browse/FLINK-8545
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
>
> As more and more users are eager for ingesting data with upsert mode in flink
> sql/table-api, it is valuable to enable table source with upsert mode. I will
> provide a design doc later and we can have more discussions. Any suggestions
> are warmly welcomed !
>
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