xiangyu feng created FLINK-37227:
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             Summary: Support Reuse Multiple Table Sinks in Planner
                 Key: FLINK-37227
                 URL: https://issues.apache.org/jira/browse/FLINK-37227
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: xiangyu feng


When users are trying to partial-update a downstream table from multiple source 
tables, they have to submit a job within multiple datastreams. For downstream 
storage like data lakes, there will have concurrency issue for multiple writers 
ingesting data at the same time. Users in the case may have to manually union 
all datastreams in Flink SQL which is hard to use. 

It would be better if flink planer can support reuse the sink nodes across 
multiple datastreams. This would a great usability improvement for users using 
partial-update features.



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