pitrou commented on a change in pull request #7378:
URL: https://github.com/apache/arrow/pull/7378#discussion_r439478696
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File path: cpp/src/arrow/type_fwd.h
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@@ -351,39 +358,21 @@ std::shared_ptr<DataType> ARROW_EXPORT
time64(TimeUnit::type unit);
std::shared_ptr<DataType> ARROW_EXPORT
struct_(const std::vector<std::shared_ptr<Field>>& fields);
-/// \brief Create a UnionType instance
-std::shared_ptr<DataType> ARROW_EXPORT
-union_(const std::vector<std::shared_ptr<Field>>& child_fields,
Review comment:
This is more of a "don't break third-party code" concern.
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