yashmayya commented on code in PR #16992:
URL: https://github.com/apache/pinot/pull/16992#discussion_r2418201897


##########
pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/TransformFunctionFactory.java:
##########
@@ -324,6 +323,15 @@ public static TransformFunction get(ExpressionContext 
expression, Map<String, Co
               GenerateArrayTransformFunction::new);
         }
 
+        List<ExpressionContext> arguments = function.getArguments();
+        int numArguments = arguments.size();
+
+        // Build child transform functions first to derive argument data types 
for scalar function polymorphism
+        List<TransformFunction> transformFunctionArguments = new 
ArrayList<>(numArguments);
+        for (ExpressionContext argument : arguments) {
+          
transformFunctionArguments.add(TransformFunctionFactory.get(argument, 
columnContextMap, queryContext));
+        }

Review Comment:
   Bad AI - they're only being built once, the older code was simply moved up 
in this method.



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