fx19880617 commented on a change in pull request #5795:
URL: https://github.com/apache/incubator-pinot/pull/5795#discussion_r466071366



##########
File path: 
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/AggregationFunctionFactory.java
##########
@@ -45,10 +45,12 @@ private AggregationFunctionFactory() {
   public static AggregationFunction getAggregationFunction(FunctionContext 
function, QueryContext queryContext) {
     try {
       String upperCaseFunctionName = function.getFunctionName().toUpperCase();
+      AggregationFunctionType aggregationFunctionType =
+          
AggregationFunctionType.getAggregationFunctionType(upperCaseFunctionName);
       List<ExpressionContext> arguments = function.getArguments();
       ExpressionContext firstArgument = arguments.get(0);
-      if (upperCaseFunctionName.startsWith("PERCENTILE")) {
-        String remainingFunctionName = upperCaseFunctionName.substring(10);
+      if 
(aggregationFunctionType.getName().toUpperCase().startsWith("PERCENTILE")) {

Review comment:
       We defined enums as:
   ```
     PERCENTILEMV("percentileMV"),
     PERCENTILEESTMV("percentileEstMV"),
     PERCENTILETDIGESTMV("percentileTDigestMV"),
   ```




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