kazuyukitanimura commented on issue #477:
URL: 
https://github.com/apache/datafusion-comet/issues/477#issuecomment-3140788382

   Thanks @kination 
   In the unhex test 
https://github.com/apache/datafusion-comet/blob/main/spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala#L1433
   We only have limited test cases.
   You can use `makeParquetFileAllPrimitiveTypes` to create test dictionary 
values and some random values
   
   The test case with dictionary may fail because I do not see dictionary 
handling at 
https://github.com/apache/datafusion-comet/blob/main/native/spark-expr/src/math_funcs/unhex.rs#L67
   
   It is possible the tests with dictionary still passes if we are unpacking in 
advance.


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