eldenmoon opened a new pull request, #65660:
URL: https://github.com/apache/doris/pull/65660
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: A distributed ordered query could return a VARIANT root
value such as [] even though sparse object fields were present. Row-copy
reconstruction changed dense/sparse layout, pending default suffixes were
omitted, and root visibility did not consider sparse row entries. Preserve
physical structure during row copy, materialize suffix defaults, and prefer
sparse/object fields over root serialization.
### Release note
Fix incorrect VARIANT results in distributed ordered queries with sparse
subcolumns.
### Check List (For Author)
- Test:
- Regression test: variant_p0/test_topn_lazy_materialize_sparse_variant
- Unit Test: three focused ColumnVariantTest cases
- ASAN BE build
- Behavior changed: Yes (VARIANT rows with sparse object fields are
serialized correctly instead of an unrelated root value)
- Does this need documentation: No
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