fx19880617 commented on issue #6412:
URL: 
https://github.com/apache/incubator-pinot/issues/6412#issuecomment-755041894


   sample exceptions from query console:
   ```
   [
     {
       "errorCode": 200,
       "message": 
"QueryExecutionError:\norg.antlr.v4.runtime.misc.ParseCancellationException\n\tat
 
org.antlr.v4.runtime.BailErrorStrategy.recoverInline(BailErrorStrategy.java:66)\n\tat
 org.antlr.v4.runtime.Parser.match(Parser.java:203)\n\tat 
org.apache.pinot.pql.parsers.PQL2Parser.expression(PQL2Parser.java:831)\n\tat 
org.apache.pinot.pql.parsers.PQL2Parser.expression(PQL2Parser.java:748)\n\tat 
org.apache.pinot.pql.parsers.Pql2Compiler.parseToAstNode(Pql2Compiler.java:148)\n\tat
 
org.apache.pinot.pql.parsers.Pql2Compiler.compileToExpressionTree(Pql2Compiler.java:153)\n\tat
 
org.apache.pinot.common.request.transform.TransformExpressionTree.compileToExpressionTree(TransformExpressionTree.java:46)\n\tat
 
org.apache.pinot.broker.requesthandler.BaseBrokerRequestHandler.handleSubquery(BaseBrokerRequestHandler.java:471)\n\tat
 
org.apache.pinot.broker.requesthandler.BaseBrokerRequestHandler.handleRequest(BaseBrokerRequestHandler.java:215)\n\tat
 org.apache.pinot.broker.api.resources.PinotClientR
 equest.processSqlQueryPost(PinotClientRequest.java:155)\n\tat 
sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)\n\tat 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat
 java.lang.reflect.Method.invoke(Method.java:498)\n\tat 
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)"
     }
   ]
   ```


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