Hequn Cheng commented on FLINK-8545:

Hi, the {{Tuple}} input format is a good choice. It is consistent with the 

Yes, upsert stream source should have state so that to generate retract 
messages. As for the problem of deletes on non-inserted keys, if i understand 
correctly, do you mean caching the unordered delete message until the 
corresponding insert message comes? I was think the scenario that only delete 
messages are ingested. 




> 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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