wirybeaver commented on code in PR #15203:
URL: https://github.com/apache/pinot/pull/15203#discussion_r2076332040


##########
pinot-common/src/main/java/org/apache/pinot/common/utils/config/QueryOptionsUtils.java:
##########
@@ -182,6 +185,19 @@ public static Integer 
getNumReplicaGroupsToQuery(Map<String, String> queryOption
     return checkedParseIntPositive(QueryOptionKey.NUM_REPLICA_GROUPS_TO_QUERY, 
numReplicaGroupsToQuery);
   }
 
+  public static List<Integer> getOrderedPreferredReplicas(Map<String, String> 
queryOptions) {
+    String orderedPreferredReplicas = 
queryOptions.get(QueryOptionKey.ORDERED_PREFERRED_REPLICAS);
+    if (orderedPreferredReplicas == null) {
+      return Collections.emptyList();
+    }
+    String[] replicas = orderedPreferredReplicas.split("\\|");

Review Comment:
   self review: cannot use comma as the delimiter of replica group list because 
query option use comma as the delimiter of different options



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