fix: prevent unnecessary key updates in index_gt::update

yoonseok-kim · yoonseok-kim · commit 244bb773589f · 2025-11-26T19:18:44.000+09:00
diff --git a/include/usearch/index.hpp b/include/usearch/index.hpp
@@ -2987,7 +2987,8 @@ class index_gt {
             }
             form_reverse_links_(metric, updated_slot, closest_view, value, level, context);
         }
-        updated_node.key(key);
+        if (static_cast<vector_key_t>(updated_node.key()) != key)
+            updated_node.key(key);
 
         // Normalize stats
         result.computed_distances = context.computed_distances - result.computed_distances;

Original file line number	Diff line number	Diff line change
`@@ -2987,7 +2987,8 @@ class index_gt {`
`2987`	`2987`	`}`
`2988`	`2988`	`form_reverse_links_(metric, updated_slot, closest_view, value, level, context);`
`2989`	`2989`	`}`
`2990`		`- updated_node.key(key);`
	`2990`	`+ if (static_cast<vector_key_t>(updated_node.key()) != key)`
	`2991`	`+ updated_node.key(key);`
`2991`	`2992`
`2992`	`2993`	`// Normalize stats`
`2993`	`2994`	`result.computed_distances = context.computed_distances - result.computed_distances;`