fx19880617 commented on a change in pull request #5513:
URL: https://github.com/apache/incubator-pinot/pull/5513#discussion_r437766763



##########
File path: 
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java
##########
@@ -184,6 +192,18 @@ public BrokerResponse handleRequest(JsonNode request, 
@Nullable RequesterIdentit
       requestStatistics.setErrorCode(QueryException.PQL_PARSING_ERROR_CODE);
       return new 
BrokerResponseNative(QueryException.getException(QueryException.PQL_PARSING_ERROR,
 e));
     }
+    if (isLiteralOnlyQuery(brokerRequest)) {
+      LOGGER.info("Request {} contains only Literal, skipping server query: 
{}", requestId, query);
+      try {
+        BrokerResponse brokerResponse =
+            processLiteralOnlyBrokerRequest(brokerRequest, 
compilationStartTimeNs, requestStatistics);
+        return brokerResponse;
+      } catch (IllegalStateException e) {

Review comment:
       I see. My purpose here is to prevent broken query pushing down to 
servers for further processing. E.g. Function AS has two arguments first is any 
expression, second is an identifier, however if it's not, then typically it 
means the query is not writing correct.
   
   I'll change it to catch all exceptions and add a TODO for further 
refinements.




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