chore: add reference note

zhjwpku · zhjwpku · commit 58b763117847 · 2025-05-10T18:07:56.000+08:00
The visit type infrastructure is adapted from apache arrow. Add a reference note per @lidavidm's suggestion. Signed-off-by: Junwang Zhao <zhjwpku@gmail.com>
diff --git a/src/iceberg/util/visit_type.h b/src/iceberg/util/visit_type.h
@@ -25,6 +25,9 @@
 #include "iceberg/util/unreachable.h"
 #include "iceberg/util/visitor_generate.h"
 
+// Adapted from Apache Arrow
+// https://github.com/apache/arrow/blob/main/cpp/src/arrow/visit_type_inline.h
+
 namespace iceberg {
 
 #define TYPE_VISIT_INLINE(TYPE_CLASS)                                   \
