FrankChen021 commented on a change in pull request #12105:
URL: https://github.com/apache/druid/pull/12105#discussion_r776549385



##########
File path: 
processing/src/main/java/org/apache/druid/segment/DimensionDictionary.java
##########
@@ -84,6 +84,19 @@ public T getValue(int id)
     }
   }
 
+  public void getValuesInto(int[] ids, T[] values)
+  {
+    lock.readLock().lock();
+    try {
+      for (int i = 0; i < ids.length; i++) {

Review comment:
       Yes, handling generic in java is a little complicated. How about using 
`List<T>` as the returning type? This won't introduce any magic code.




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