crepererum opened a new issue, #6083:
URL: https://github.com/apache/arrow-datafusion/issues/6083

   ### Describe the bug
   
   `ScalarValue::to_array` cannot create true NULL arrays for structs. Instead 
it creates a struct where all fields are NULL (which is not the same).
   
   ### To Reproduce
   
   `ScalarValue::Struct(None, ...).to_array()`
   
   ### Expected behavior
   
   The value should be null.
   
   ### Additional context
   
   This should just create a NULL array:
   
   
https://github.com/apache/arrow-datafusion/blob/26bf31ebbc1274d0f2680d4b944145e794406188/datafusion/common/src/scalar.rs#L2779-L2790


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