eldenmoon opened a new pull request, #37526:
URL: https://github.com/apache/doris/pull/37526

   …34925)
   
   1. Moved variant flatten and flush logic to 
`_append_block_with_variant_subcolumns` in segment writer to simplify handling 
partial updates.
   2. Ensured rowset schema is refreshed during partial updates for tables with 
variant types, preventing stale schemas and incorrect data reads.
   3. Removed `_output_as_raw_json` as the segment writer now handles variant 
flatten and flush logic, which was used for schema change, but t flatten and 
flush already handled in segment writer now.
   4. Implemented element_at function in BE for non-scalar variants to enhance 
functionality.
   
   ## Proposed changes
   
   Issue Number: close #xxx
   
   <!--Describe your changes.-->
   
   


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