marvinlanhenke commented on issue #10926:
URL: https://github.com/apache/datafusion/issues/10926#issuecomment-2171471803

   > I actually think using `new_null_array` is wrong here. It returns the 
wrong type
   
   I passed `&DataType::UInt64` into `new_null_array(...)`. However, your 
approach solves the issue with downcasting the result from new_null_array so it 
makes more sense here. Thank you.
   
   Just to confirm my understanding (regarding my second question) 
`row_group_row_counts` should also return a null_array when we reference a 
non-existing column correct?


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