tobixdev commented on issue #12644:
URL: https://github.com/apache/datafusion/issues/12644#issuecomment-2592666978

   I second @paleolimbot here, as I am also interested in this topic.
   First of all, thank you for all your efforts in this area!
   
   To provide some context, we are currently creating a prototype that handles 
data that is encoded as a union with 10-ish different variants. Logically, this 
union represents the encoding of a single type. While we make ends meet by 
creating logical plans manually with specialized UDFs (e.g., for equality),  we 
are in a very early phase. Only working with physical types will add lots of 
complexity to our code that can be eliminated with [logical types](#12622) and 
its benefits (e.g., #12635).
   
   So what our (dream) scenario is that we could define this extension type 
(and its encoding) together with implementations for equality, orderings, etc, 
and DataFusion would automatically make use of these when joining or sorting 
(AFAIK, this should be supported according to #7923).
   
   I'd like to support you in these efforts. However, while I read a few 
discussions and proposals, I am still a bit lost on where I can/should help out 
as this is (from what I see) a huge ongoing project across multiple issues and 
epics. Do you have pointers on where I could start helping out?  For example, I 
found #13301, but I am unsure if the efforts on simple functions #12635 make 
these changes somewhat premature.
   
   Thank you for helping me to navigate this project!
   


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