Timo Walther created FLINK-21989:
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             Summary: Add a SupportsSourceWatermark ability interface
                 Key: FLINK-21989
                 URL: https://issues.apache.org/jira/browse/FLINK-21989
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API, Table SQL / Planner
            Reporter: Timo Walther
            Assignee: Timo Walther


FLINK-21899 added a dedicated function that can be used in watermark 
definitions. Currently, the generated watermark strategy is invalid because of 
the exception that we throw in the function’s implementation. We should 
integrate this concept deeper into the interfaces instead of the need to 
implement some expression analyzing utility for every source.

We propose the following interface:
SupportsSourceWatermark {
  void applySourceWatermark();
}
 



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