mapleFU commented on code in PR #13901:
URL: https://github.com/apache/arrow/pull/13901#discussion_r1738923863


##########
cpp/src/arrow/array/validate.cc:
##########
@@ -985,10 +985,22 @@ Status ValidateArrayFull(const Array& array) { return 
ValidateArrayFull(*array.d
 
 ARROW_EXPORT
 Status ValidateUTF8(const ArrayData& data) {
-  DCHECK(data.type->id() == Type::STRING || data.type->id() == 
Type::STRING_VIEW ||
-         data.type->id() == Type::LARGE_STRING);
-  UTF8DataValidator validator{data};
-  return VisitTypeInline(*data.type, &validator);
+  const auto& storage_type =
+      (data.type->id() == Type::EXTENSION)
+          ? checked_cast<const ExtensionType&>(*data.type).storage_type()
+          : data.type;
+  DCHECK(storage_type->id() == Type::STRING || storage_type->id() == 
Type::STRING_VIEW ||
+         storage_type->id() == Type::LARGE_STRING);
+
+  if (data.type->id() == Type::EXTENSION) {
+    const auto& ext_data = std::make_shared<ArrayData>(data);

Review Comment:
   ```suggestion
       ArrayData ext_data(data);
       ext_data.type = storage_type;
   ```
   
   can we do like this?



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