should be it

external/duckdb/extension/parquet/include/parquet_shredding.hpp

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "duckdb/common/serializer/buffered_file_writer.hpp"
+#include "duckdb/common/case_insensitive_map.hpp"
+#include "duckdb/common/types/variant.hpp"
+
+namespace duckdb {
+
+struct ShreddingType;
+
+struct ChildShreddingTypes {
+public:
+	ChildShreddingTypes();
+
+public:
+	ChildShreddingTypes Copy() const;
+
+public:
+	void Serialize(Serializer &serializer) const;
+	static ChildShreddingTypes Deserialize(Deserializer &source);
+
+public:
+	unique_ptr<case_insensitive_map_t<ShreddingType>> types;
+};
+
+struct ShreddingType {
+public:
+	ShreddingType();
+	explicit ShreddingType(const LogicalType &type);
+
+public:
+	ShreddingType Copy() const;
+
+public:
+	void Serialize(Serializer &serializer) const;
+	static ShreddingType Deserialize(Deserializer &source);
+
+public:
+	static ShreddingType GetShreddingTypes(const Value &val);
+	void AddChild(const string &name, ShreddingType &&child);
+	optional_ptr<const ShreddingType> GetChild(const string &name) const;
+
+public:
+	bool set = false;
+	LogicalType type;
+	ChildShreddingTypes children;
+};
+
+} // namespace duckdb