Hequn Cheng commented on FLINK-8545:

[~pnowojski] Hi, current design is to add an {{UpsertStreamTable}} and use a 
rule to generate a {{DataStreamLastRow}} node. The node will process the upsert 
stream similar to {{group by + last}}. Furthermore, we also need a 
{{CalcLastRowTransposeRule}} to minimise the state. 
It would be great to get your suggestions on it.

> 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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