zhangstar333 opened a new pull request, #20890:
URL: https://github.com/apache/doris/pull/20890

    * in order to solve agg of sum/count is not compatibility during the 
upgrade process.
    * in PR #20370 have changed the serialize type and serialize column of 
sum/count
    * before is ColumnVector, now sum/count change to use 
ColumnFixedLengthObject
    * so during the upgrade process, will be not compatible if exist Old BE and 
Newer BE
   
   ## Proposed changes
   
   Issue Number: close #xxx
   
   <!--Describe your changes.-->
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[[email protected]](mailto:[email protected]) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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