sam-1112 commented on PR #6110:
URL: 
https://github.com/apache/datafusion-comet/pull/6110#issuecomment-5780157725

   @andygrove @Visorgood Thanks for flagging #5802.
   
   For collation, I agree that JVM columnar shuffle has no native partition-id 
calculation. However, scan fallback does not make this guard unreachable: a 
non-default collation can be introduced above a normal scan or come from 
`VALUES`. The existing collation suite relies on the shuffle rule as a safety 
boundary against raw-byte Comet sort or aggregate behavior. I would keep the 
guard, but revise the rationale rather than describe it as unreachable.
   
   For #5802, I suggest #6110 lands first. I will then rebase #5802 and update 
its columnar-shuffle tests and docs: with the dispatcher off, #6110 can use JVM 
columnar shuffle; with it on, #5802 can enable native shuffle.


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