[GitHub] arunmahadevan edited a comment on issue #23576: [SPARK-26655] [SS] Support multiple aggregates in append mode

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arunmahadevan edited a comment on issue #23576: [SPARK-26655] [SS] Support multiple aggregates in append mode
URL: https://github.com/apache/spark/pull/23576#issuecomment-461159066
 
 
   >It’s not obvious to me that it’s valid for a stateful operator to reach through an arbitrary child and grab a watermark from the other side.
   
   @jose-torres, we don't pick an arbitrary child. We consider all the event time inputs (children) to the stateful operator and compute the watermark as the minimum of all the input watermarks (which is the EventTime minus the lag of each child EventTimeWatermarkExec).

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