wjones127 commented on PR #34697:
URL: https://github.com/apache/arrow/pull/34697#issuecomment-1485387051

   > as RUN_END_ENCODED is a new type, we could add this layout validation in 
this switch without breaking existing code as REEs are not used yet. This is 
our chance :-)
   
   So we have added an equivalent check to this within the REE array path:
   
   
https://github.com/apache/arrow/blob/4a0fc2868cbb7c2e78f76855ad476c260b92b495/cpp/src/arrow/array/validate.cc#L648-L650
   
   My questions is whether we should enable this for other arrays that have 
always null buffers, such as NullArray and UnionArray. It seems we don't 
enforce this for these other types right now in validate, and I'd rather not 
change that in this PR. 


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