alamb commented on issue #6784:
URL: 
https://github.com/apache/arrow-datafusion/issues/6784#issuecomment-1615148606

   I would love to know what you think about dict_id handling in general -- 
from what I can see so far it is not well supported in arrow-rs. We have 
similar problems with `metadata` which can be hung off a schema or a field and 
gets lost frequently
   
   I am also not 100% clear if dict_id is supposed to (potentially) different 
per record batch or if it would be the same for the entire plan 
   
   One thing that might be possible is to compare the pointer for the 
dictionary array to decide if it was the same dictionary rather than trying to 
keep `dict_id` all the way through the plan 🤔 


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