abhioncbr commented on code in PR #10472:
URL: https://github.com/apache/pinot/pull/10472#discussion_r1150743565


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/operands/FunctionOperand.java:
##########
@@ -52,6 +52,9 @@ public FunctionOperand(RexExpression.FunctionCall 
functionCall, DataSchema dataS
     _resultName = computeColumnName(functionCall.getFunctionName(), 
_childOperandList);
     // TODO: Check type match between functionCall's data type and result type.
     _resultType = 
FunctionUtils.getColumnDataType(_functionInvoker.getResultClass());
+
+    boolean isTypeMatched = functionCall.getDataType() == 
_resultType.toDataType();
+    Preconditions.checkState(isTypeMatched, "Mismatch function data type and 
result type");

Review Comment:
   Thanks for the help. I have a couple of questions. 
   - For conversion(`parameterType.convert`), do I have to convert the 
`_resultType`(`fieldSpec.DataType`)  to PinotDataType and perform the 
conversion or use the conversion function`FieldSpec.convertInternal` directly.
   - Second, what should be the outcome of the failing `caswhen` query? It 
should fail, or with conversion, it should execute without error.
   
   Thanks.



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