fix comments

Author: nullccxsy

src/iceberg/schema.cc

@@ -26,7 +26,6 @@
 #include "iceberg/type.h"
 #include "iceberg/util/formatter.h"  // IWYU pragma: keep
 #include "iceberg/util/macros.h"
-#include "iceberg/util/string_utils.h"
 #include "iceberg/util/visit_type.h"
 
 namespace iceberg {

src/iceberg/schema.h

@@ -32,20 +32,10 @@
 #include "iceberg/result.h"
 #include "iceberg/schema_field.h"
 #include "iceberg/type.h"
+#include "iceberg/util/string_utils.h"
 
 namespace iceberg {
 
-/// \brief Transparent hash function that supports std::string_view as lookup key
-///
-/// Enables std::unordered_map to directly accept std::string_view lookup keys
-/// without creating temporary std::string objects, using C++20's transparent lookup.
-struct string_hash {
-  using hash_type = std::hash<std::string_view>;
-  using is_transparent = void;
-
-  std::size_t operator()(std::string_view str) const { return hash_type{}(str); }
-};
-
 /// \brief A schema for a Table.
 ///
 /// A schema is a list of typed columns, along with a unique integer ID.  A

src/iceberg/util/string_util.h

@@ -46,4 +46,15 @@ class ICEBERG_EXPORT StringUtils {
   }
 };
 
+/// \brief Transparent hash function that supports std::string_view as lookup key
+///
+/// Enables std::unordered_map to directly accept std::string_view lookup keys
+/// without creating temporary std::string objects, using C++20's transparent lookup.
+struct string_hash {
+  using hash_type = std::hash<std::string_view>;
+  using is_transparent = void;
+
+  std::size_t operator()(std::string_view str) const { return hash_type{}(str); }
+};
+
 }  // namespace iceberg