github-actions[bot] commented on code in PR #65087:
URL: https://github.com/apache/doris/pull/65087#discussion_r3510066241
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be/src/core/column/column_variant.cpp:
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@@ -826,19 +825,28 @@ size_t ColumnVariant::allocated_bytes() const {
return res;
}
-void ColumnVariant::for_each_subcolumn(ColumnCallback callback) {
Review Comment:
`ColumnVariant` is still missing from the shared-child COW tests. This PR
changes `ColumnVariant::mutate_subcolumns()` to detach every materialized
subcolumn part plus `serialized_sparse_column` and
`serialized_doc_value_column`, but `column_mutate_subcolumns_test.cpp` only
exercises Nullable/Array/Map/Const/Struct. Existing Variant tests cover general
filter behavior and `clone()` deep-copying, but they do not keep aliases to
these child columns and then call `IColumn::mutate(std::move(variant))` on an
exclusive parent. A missed child here would leave the mutated Variant sharing
storage with another owner, which is exactly the failure mode these new tests
are meant to catch. Please add a Variant case that aliases at least a
materialized subcolumn and the serialized sparse/doc-value map columns, mutates
the Variant, then writes or filters the result and asserts the aliases remain
unchanged.
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