carryxyh commented on issue #8243: [FLINK-12299] 
ExecutionConfig#setAutoWatermarkInterval should check param(interval should not 
less than zero)
URL: https://github.com/apache/flink/pull/8243#issuecomment-492560054
 
 
   Very kind of u to help for this.
   IMO, `0` is not appropriate for the `EventTime` mode.
   Perhaps a correlation check is necessary. For example, in the `EventTime` 
mode, we need to ensure that `auto watermark` is enabled(means auto watermark 
should > 0).
   
   How do u think about it?

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