andygrove commented on PR #7307:
URL: 
https://github.com/apache/datafusion-comet/pull/7307#issuecomment-6480284337

   Thanks for the review. I pushed 2c30c5762e with the suite changes above. 
`CometInMemoryCacheSuite` now gets its zstd codec from 
`CometCachedBatchHelper.compressionCodec("zstd")`, so all four places that 
built Arrow's codec directly go through `CometZstdCompressionCodec`. I also 
rewrapped a comment in `CachedBatchIpc` that was one character over the 
scalastyle limit.
   
   On Spark having the same exposure: agreed, I read the 19.0.0 bytecode and 
`ArrowCompressionUtils` and `ArrowCachedBatchSerializer` both build 
`ZstdCompressionCodec` directly (`ArrowCompressionUtils` is also on 
`branch-4.1` with Arrow 18.3.0). I'll file the SPARK JIRA soon and will comment 
here once it's filed.


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