andygrove commented on PR #4019:
URL: 
https://github.com/apache/datafusion-comet/pull/4019#issuecomment-4459495347

   > > It may make sense to break down #3720 into smaller categories.
   > 
   > Sure, we can do that, but I don't think it changes the fact that we want 
to remove `native_iceberg_compat` scan. It has been deprecated since 0.15.0, is 
no longer tested in CI, and no longer works - many TPC-H queries fail if we 
select this scan. If we want to reverse course on removing it, we should 
re-enable all of the tests and fix the regressions. Note that this scan also 
has limitations that `native_datafusion` does not have. These are documented in 
the compatibility guide. It also has worse performance.
   > 
   > Once #4229 is merged, I think we are down to 7 tests ignored, and these 
are edge/corner cases which are already documented in the compatibility guide. 
These could eventually be fixed with upstream changes to arrow-rs and 
datafusion if we really think these are worth the investment.
   
   I burned some tokens working on 
https://github.com/apache/datafusion-comet/pull/4229 overnight and maybe have 
all the tests unignored for 4.1.1 ... I'll keep my eye on CI today ... would be 
great to get reviews on that one so we can unblock this work


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