[GitHub] [doris] starocean999 commented on pull request #11212: [fix] the nullable info is lost in ifnull expr

[GitBox]

starocean999 commented on PR #11212:
URL: https://github.com/apache/doris/pull/11212#issuecomment-1198946020

   > Do you have any case to repeat the error?
   > 
   > ```java
   >             if (children.get(0).isNullable()) {
   >                 return children.get(1).isNullable();
   >             }
   >             return false;
   > ```
   > 
   > The nullable here needs to be consistent with `FE`, I think we should do 
more change at `ifnull`. This is the modification of get_return_type_impl, we 
also need to implement similar logic in execute_impl 
![图片](https://user-images.githubusercontent.com/7939630/181000934-19b4489a-5b69-4392-9f3b-247a8c29ee5d.png)
   
   thx, the be is modified and consistent with fe now.


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