WinkerDu opened a new issue, #2483:
URL: https://github.com/apache/arrow-datafusion/issues/2483

   **Is your feature request related to a problem or challenge? Please describe 
what you are trying to do.**
   Since DF has a real `NULL` support from #2364 , based on this pr, I'd like 
to file a ticket to track this trivial literal `NULL` supports for DF 
expressions. 
   - [x] #2364
   - [ ] #2482
   - [ ] Date, Timestemp comparisons with literal `NULL`
   - [ ] Add, Minus, Multiply, divide expressions work with literal `NULL`
   - [ ] Regex expressions work with literal `NULL`
   - [ ] Like, NotLike expressions work with literal `NULL`
   - [ ] Between expression works with literal `NULL`
   
   **Additional context**
   This issues is based on #1184, thanks @alamb 
   


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