marin-ma commented on issue #7760:
URL: 
https://github.com/apache/incubator-gluten/issues/7760#issuecomment-2454602599

   @j7nhai Thanks for reporting this issue. The example provided in 
https://github.com/apache/incubator-gluten/blob/main/docs/developers/VeloxUDF.md
 cannot be offloaded. `hive_string_string("hello", "world")` is foldable 
because both inputs are constants, so the evaluation is done by Spark's 
optimizer rule `ConstantFolding` before Gluten can touch it. I will update the 
document with a proper example.
   
   We do have the UT for velox udf and the input is a column. Please check 
https://github.com/apache/incubator-gluten/blob/main/backends-velox/src/test/scala/org/apache/gluten/expression/VeloxUdfSuite.scala#L163-L164
   
   


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