wuchong commented on issue #11424: [FLINK-16345][table-planner-blink] Fix 
computed column can not refer row time attribute column
URL: https://github.com/apache/flink/pull/11424#issuecomment-601655207
 
 
   > I don't fully understand this, if we just throw time indicator 
information, how to support process time field? Downstream operators how to 
know this is a process time field?
   
   We didn't drop the time indicator information. The RelDataType from 
`CatalogSourceTable` to `TableScan -> Project -> Watermark` is identical, which 
means it keeps the time indicators. After translation, the time indicator is 
attached by Watermark node. 

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