hoperunChen commented on PR #4150:
URL: https://github.com/apache/calcite/pull/4150#issuecomment-2598185320

   Alright, then we can only process the file again after the user submits the 
document.
   
   However, I don’t quite understand why the charToDecimalCast() method only 
checks for null but not for an empty string. In what scenario would forcibly 
converting an empty string and then throwing an error be considered normal 
business logic? This is just a personal question, and I’d like to seek your 
advice.


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