liukun4515 commented on issue #3479:
URL: 
https://github.com/apache/arrow-datafusion/issues/3479#issuecomment-1247427294

   The `NULL` in the SQL syntax is associated with the `DataType::NULL`.
   Now we don't support NULL data type with decimal data type yet.
   
   But I think it is easy to support them.
   
   I can help you to implement this.
   
   @kmitchener 


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