[GitHub] [superset] zhaoyongjie opened a new issue #18147: [explore] I can't select `NULL` and `empty string` in filter

[GitBox]

zhaoyongjie opened a new issue #18147:
URL: https://github.com/apache/superset/issues/18147


   I can't select `NULL` and `empty string` in Filter
   
   #### How to reproduce the bug
   1. First of all, let we create a virtual dataset from SQLLab and open this 
in Explore page.
   ```
   SELECT '' as name
   UNION ALL
   SELECT null as name
   ```
   
   2. I can't get `NULL` and `empty string` in filter.
   
   <img width="924" alt="image" 
src="https://user-images.githubusercontent.com/2016594/150731794-ccd0749a-a598-4a43-bb2e-ca2a42685db5.png";>
   
   
   3. I can manually input `<NULL>` and `<empty string>` to filter that.
   
   <img width="1399" alt="image" 
src="https://user-images.githubusercontent.com/2016594/150732033-ea7975a8-4242-4c66-9f46-df1db69a089e.png";>
   
   
   
   ### Expected results
   
   I can select `<NULL>` and `<empty string>` in filter
   
   
   
   ### Environment
   
   (please complete the following information):
   
   - browser type and version:
   - superset version: `superset version`
   - python version: `python --version`
   - node.js version: `node -v`
   - any feature flags active:
   
   ### Checklist
   
   Make sure to follow these steps before submitting your issue - thank you!
   
   - [ ] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [ ] I have reproduced the issue with at least the latest released version 
of superset.
   - [ ] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   Add any other context about the problem here.
   


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