rustyconover commented on PR #49262:
URL: https://github.com/apache/arrow/pull/49262#issuecomment-3898259720

   @raulcd, I'm a little nervous about delta dictionaries I need to read more 
into them.  
   
   My anxiety comes from if a consumer keeps a record batch in memory, and then 
a delta is applied to its dictionary it references as a new record batch 
arrives.  If that older record batch is used it would see the updated 
dictionary and potentially have incorrect values?  Or are dictionary deltas 
append only?
   
   I just don't know about dictionary deltas enough to not be anxious.  But 
I'll learn.
   


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