Petr Novotnik created FLINK-6947:

             Summary: Warn on 
                 Key: FLINK-6947
             Project: Flink
          Issue Type: Improvement
          Components: DataStream API
    Affects Versions: 1.2.1, 1.3.0
            Reporter: Petr Novotnik
            Priority: Minor

Placing timestamp assignment (and watermark generation) directly or indirectly 
after a union is generally not desirable as it may lead to surprising results 
at the client side. Ideally, timestamp assignment (and watermark generation) is 
best placed as close as possible to the data sources.  It would be nice to 
generate a warning to the user (i.e. to the log) before job execution if the 
framework detects timestamp assignment (directly or indirectly placed) after a 

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