Omega359 commented on PR #15242:
URL: https://github.com/apache/datafusion/pull/15242#issuecomment-2733390627

   
   > But I'll fix up the integration tests after work so all the checks pass 
and this is mergeable. Then maybe I can look into the above issue separately if 
that sounds good.
   
   That sounds good! I took a look at the convert_batches and I cannot see 
offhand how it is doing anything problematic. I suspect the issue is elsewhere 
and that function is just making it visible.
   
   Why a field would change from not nullable to nullable for one (or more) 
batches in a query after the first one is highly suspicious to me.
   


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