cloud-fan commented on issue #26165: [SPARK-29508][SQL] Implicitly cast strings 
in datetime arithmetic operations
URL: https://github.com/apache/spark/pull/26165#issuecomment-545022065
 
 
   Is it really a useful feature? Users can simply put the `INTERVAL` keyword 
before the string literal, like `timestamp'today' + interval'1 month'`
   
   For `timestamp_col + string_col`, I don't think it's reasonable to 
implicitly cast `string_col` to interval.  People may get null result silently 
and hide the mistake(they may pick a wrong column to add).

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