imbajin commented on code in PR #2859:
URL: 
https://github.com/apache/incubator-hugegraph/pull/2859#discussion_r2313281416


##########
hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/tx/GraphTransaction.java:
##########
@@ -775,40 +784,103 @@ protected Iterator<Vertex> queryVerticesByIds(Object[] 
vertexIds, boolean adjace
         return this.queryVerticesByIds(vertexIds, adjacentVertex, 
checkMustExist, HugeType.VERTEX);
     }
 
+    @Watched(prefix = "graph")
     protected Iterator<Vertex> queryVerticesByIds(Object[] vertexIds, boolean 
adjacentVertex,
                                                   boolean checkMustExist, 
HugeType type) {
         Query.checkForceCapacity(vertexIds.length);
 
-        // NOTE: allowed duplicated vertices if query by duplicated ids
-        List<Id> ids = InsertionOrderUtil.newList();
-        Map<Id, HugeVertex> vertices = new HashMap<>(vertexIds.length);
+        List<Id> ids;
+        Map<Id, HugeVertex> vertices;
+        boolean verticesUpdated = this.verticesInTxSize() > 0;

Review Comment:
   Consider optimizing the `verticesUpdated` check. Currently it calls 
`this.verticesInTxSize() > 0` which may iterate through all transaction maps. 
For single-ID queries, you could check more efficiently:
   
   ```java
   // More efficient check for single ID
   boolean hasLocalChanges = this.removedVertices.containsKey(id) || 
                            this.addedVertices.containsKey(id) || 
                            this.updatedVertices.containsKey(id);
   ```
   
   This would be O(1) instead of potentially O(n) for the transaction size 
calculation.



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