marvinlanhenke commented on issue #8507:
URL: 
https://github.com/apache/arrow-datafusion/issues/8507#issuecomment-1867271239

   Hi @ravikiran232 are you still working on this? 
   Since I'm a `first-timer` (as well) I took the liberty to look into this 
Issue as well, in order to learn and get a better feel for the codebase. I 
think I already found a solution. However, I don't want to steal your 
opportunity to contribute.
   
   Hi @alamb just to confirm the approach. 
   I wrote a test creating a nested schema and an expr = 
col("bid).field("auction") on which I executed nullable(). Then I included a 
guard close in the relevant match arm to check, if the parent col is nullable 
and return early if it is? Sounds about right? 
   
   If @ravikiran232 is not currently working on this anymore, I'd be more than 
happy to contribute. 
   
   Thank you for you feedback and your efforts. 


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