pitrou commented on issue #50491:
URL: https://github.com/apache/arrow/issues/50491#issuecomment-5035032029

   The 
[spec](https://arrow.apache.org/docs/format/Columnar.html#run-end-encoded-layout)
 does not require consecutive physical values to be distinct, so this is not a 
bug. However, it can be seen as a missing opportunity. The main challenge for 
improving this is to do it efficiently, which is not trivial.
   
   cc @felipecrv 


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