xiangfu0 commented on code in PR #12118:
URL: https://github.com/apache/pinot/pull/12118#discussion_r1431972919


##########
pinot-core/src/main/java/org/apache/pinot/core/operator/transform/function/CastTransformFunction.java:
##########
@@ -56,6 +56,10 @@ public void init(List<TransformFunction> arguments, 
Map<String, ColumnContext> c
     TransformFunction castFormatTransformFunction = arguments.get(1);
     if (castFormatTransformFunction instanceof LiteralTransformFunction) {
       String targetType = ((LiteralTransformFunction) 
castFormatTransformFunction).getStringLiteral().toUpperCase();
+      if ("OBJECT".equals(targetType)) {

Review Comment:
   This happens when scalar function is not explicitly registered for the 
return type.



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