mqliang commented on a change in pull request #6361:
URL: https://github.com/apache/incubator-pinot/pull/6361#discussion_r620722571



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/query/reduce/BrokerReduceService.java
##########
@@ -208,6 +209,11 @@ public BrokerResponseNative 
reduceOnDataTable(BrokerRequest brokerRequest,
       }
       numGroupsLimitReached |= 
Boolean.parseBoolean(metadata.get(MetadataKey.NUM_GROUPS_LIMIT_REACHED.getName()));
 
+      String invalidColumnNamesString = 
metadata.get(MetadataKey.INVALID_COLUMN_IN_QUERY.getName());
+      if (invalidColumnNamesString != null) {
+        invalidColumnNames = invalidColumnNames == null ? 
invalidColumnNamesString : invalidColumnNames;
+      }

Review comment:
       Can be changed as:
   ```
   if (invalidColumnNames != null && invalidColumnNamesString != null) {
           invalidColumnNames =  invalidColumnNamesString;
         }
   ```
   Which is a little bit more succinct. This is a minor comments, up to you to 
change or not. 




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