eldenmoon opened a new pull request, #63104:
URL: https://github.com/apache/doris/pull/63104

   - NestedGroup compaction targets normally do not carry extracted subcolumns, 
so preserving existing target subcolumns can miss regular paths that sit beside 
NG arrays.
   
   - Collect Variant extended info for NG roots, keep NG physical children 
owned by the NestedGroup writer, and materialize only regular non-NG paths 
through the existing data-types helper. Typed paths continue to use 
get_compaction_typed_columns(), while doc-mode and normal non-NG Variant flows 
keep their existing ordering.
   
   - Also record materialized regular paths in sub_path_set and update schema 
util coverage for the new target-schema contract.


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