walterddr commented on code in PR #11274:
URL: https://github.com/apache/pinot/pull/11274#discussion_r1285114302


##########
pinot-query-planner/src/main/java/org/apache/calcite/sql/fun/PinotOperatorTable.java:
##########
@@ -115,25 +109,207 @@ public final void initNoDuplicate() {
     //   2. register special handling that differs from calcite standard.
     for (TransformFunctionType transformFunctionType : 
TransformFunctionType.values()) {
       if (transformFunctionType.getSqlKind() != null) {
+        Set<String> registeredFunctionNames = new HashSet<>();
+        String transformFunctionTypeName = transformFunctionType.getName();
         // 1. Register the aggregation function with Calcite
-        registerTransformFunction(transformFunctionType.getName(), 
transformFunctionType);
+        registerTransformFunction(transformFunctionTypeName, 
transformFunctionType);
+        registeredFunctionNames.add(transformFunctionTypeName.toUpperCase());
+
         // 2. Register the aggregation function with Calcite on all 
alternative names
         List<String> alternativeFunctionNames = 
transformFunctionType.getAlternativeNames();
         for (String alternativeFunctionName : alternativeFunctionNames) {
+          if 
(registeredFunctionNames.contains(alternativeFunctionName.toUpperCase())) {
+            continue;
+          }
           registerTransformFunction(alternativeFunctionName, 
transformFunctionType);
+          registeredFunctionNames.add(alternativeFunctionName.toUpperCase());
         }
       }
     }
   }
 
+  private void initPinotOverrideSql() {
+    register(new PinotSqlCoalesceFunction());
+  }
+
+  private void initCalciteStandardSql() {

Review Comment:
   Good idea. 



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