sunithabeeram commented on a change in pull request #3568: Add guava cache to 
cache table schema in pinot broker
URL: https://github.com/apache/incubator-pinot/pull/3568#discussion_r237748069
 
 

 ##########
 File path: 
pinot-broker/src/main/java/com/linkedin/pinot/broker/requesthandler/BaseBrokerRequestHandler.java
 ##########
 @@ -311,6 +329,68 @@ private void validateRequest(BrokerRequest brokerRequest) 
{
             "Value for 'LIMIT' (" + limit + ") exceeds maximum allowed value 
of " + _queryResponseLimit);
       }
     }
+
+    // Checks whether the query contains non-existence columns.
+    // Table name has already been verified before hitting this line.
+    String tableName = brokerRequest.getQuerySource().getTableName();
 
 Review comment:
   +1 for conf control.

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