yaooqinn commented on issue #26412: [SPARK-29774][SQL] Date and Timestamp type 
+/- null should be null as Postgres
URL: https://github.com/apache/spark/pull/26412#issuecomment-560263988
 
 
   > I think it's all because we hack the `Add` operator to do date add. Now we 
need to add more hacks in the type coercion rules.
   > 
   > How about we create `UnresolvedAdd` in the parser, and convert it to 
either `Add` or `DateAdd` in the analyzer?
   
   This is better, I will follow this sugguestion, thanks.

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