Yukang-Lian opened a new pull request, #31824:
URL: https://github.com/apache/doris/pull/31824

   Problem: An error is encountered when executing a schema change on a unique 
table to add a column with a complex type, such as bitmap, as documented in 
https://github.com/apache/doris/issues/31365
   
   Reason: The error arises because the schema change logic erroneously applies 
an aggregation check for new columns across all table types, demanding an 
explicit aggregation type declaration. However, unique and duplicate tables 
inherently assume default aggregation types for newly added columns, leading to 
this misstep.
   
   Solution: The schema change process for introducing new columns needs to 
distinguish between table types accurately. For unique and duplicate tables, it 
should automatically assign the appropriate aggregation type, which, for the 
purpose of smooth integration with subsequent processes, should be set to NONE.
   
   ## 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 
[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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