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

[GitBox]

BiteTheDDDDt commented on PR #11212:
URL: https://github.com/apache/doris/pull/11212#issuecomment-1195392540

   Do you have any case to repeat the error?
   
   ```java
               if (children.get(0).isNullable()) {
                   return children.get(1).isNullable();
               }
   ```
   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)
   


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