xy720 opened a new pull request #4693:
URL: https://github.com/apache/incubator-doris/pull/4693


   ## Proposed changes
   
   Fix #4692 
   The reason of this bug is case-when statement may produce a implicit 
CastExpr<SlotRef> in SelectListItem in analyze step.
   And these CastExpr<SlotRef> in SelectListItem will not be re-anlyze after 
rewrite step(case-when statement needs rewrite), which will result in the wrong 
number of self-incrementing SlotDescriptor ID .
   
   ## Types of changes
   
   What types of changes does your code introduce to Doris?
   _Put an `x` in the boxes that apply_
   
   - [x] Bugfix (non-breaking change which fixes an issue)
   
   ## Checklist
   
   _Put an `x` in the boxes that apply. You can also fill these out after 
creating the PR. If you're unsure about any of them, don't hesitate to ask. 
We're here to help! This is simply a reminder of what we are going to look for 
before merging your code._
   
   - [x] I have create an issue on (Fix #4692 ), and have described the 
bug/feature there in detail
   - [x] Compiling and unit tests pass locally with my changes
   - [x] I have added tests that prove my fix is effective or that my feature 
works
   


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