[I] ScalarUDF with zero arguments should be provided with one null array as parameter [arrow-datafusion]

["viirya (via GitHub)" <gi...@apache.org>]

viirya opened a new issue, #9032:
URL: https://github.com/apache/arrow-datafusion/issues/9032

   ### Describe the bug
   
   According to `ScalarUDFImpl` document, if the function has zero argument, it will be passed a single element slice which is a a null array to indicate the batch's row count. But currently it is provided a null scalar.
   
   This is reported by @dadepo in https://github.com/apache/arrow-datafusion/issues/8866#issuecomment-1913613142. 
   
   ### To Reproduce
   
   https://github.com/apache/arrow-datafusion/issues/8866#issuecomment-1913613142 provides a reproducible test.
   
   ### Expected behavior
   
   `ScalarUDFImpl` implementation, when it has zero argument, it will be passed a single element slice which is a a null array to indicate the batch's row count.
   
   
   ### Additional context
   
   _No response_


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