zhangstar333 opened a new pull request, #10661:
URL: https://github.com/apache/doris/pull/10661

   [refactor][vectorized] refactor first/last value agg functions
   
   At the beginning, the implementation of **first/last value** is used for 
window functions, and **lead/lag** is also mixed in the implementation;
   Later, when aiming at the **replace** model, also borrowed the basic 
implementation of first/last and made some changes.
   Then, when **load**, also made some changes, so it became more and more 
complex. 
   And now, the two are separated and further optimized respectively
   
   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem Summary:
   
   Describe the overview of changes.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: (Yes/No/I Don't know)
   2. Has unit tests been added: (Yes/No/No Need)
   3. Has document been added or modified: (Yes/No/No Need)
   4. Does it need to update dependencies: (Yes/No)
   5. Are there any changes that cannot be rolled back: (Yes/No)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   


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