HeartSaVioR commented on issue #24936: [SPARK-24634][SS] Add a new metric 
regarding number of rows later than watermark
URL: https://github.com/apache/spark/pull/24936#issuecomment-504471573
 
 
   As I stated in SPARK-28074 - #24890, this could be used as an indicator of 
unexpected discarded rows due to watermark, especially between multiple 
stateful operators.
   
   DiscardLateRowsExec doesn't implement CodegenSupport yet. As FilterExec 
implements CodegenSupport and DiscardLateRowsExec is simpler version of 
FilterExec, I guess I could address it. I'll try it out.

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