zhangfengcdt commented on PR #5935:
URL: 
https://github.com/apache/datafusion-comet/pull/5935#issuecomment-5688061471

   > The added fallback examples match the current gate at `251fb7d4`. My 
[existing 
approval](https://github.com/apache/datafusion-comet/pull/5935#pullrequestreview-5214954348)
 stands. The source is unchanged, and the resolved fixture P2 remains fixed.
   > 
   > Please align two description details with the reviewed behavior: the 
helper invokes `io(location)` to inspect the instantiated delegate, and the 
resolver tests exercise delegate resolution and write planning. On pre-1.10 
runtimes, their passing result alone does not prove that `GCSFileIO.initialize` 
ran. The prior 1.5.2/1.8.1 component controls lacked Google authentication 
classes, so that direct initialization coverage remains unverified.
   > 
   > [Required 
Checks](https://github.com/apache/datafusion-comet/actions/runs/35008700813/job/104548144254)
 is now green: 53 successful checks and 12 skips. The completed Spark 3.4/3.5 
scan jobs also passed the focused GCS cases on merge `ab0aa7bd`, whose full 
tree matches this head. No unchanged broad suites were rerun locally, and no 
native GCS write is claimed.
   
   I have updated the following to align with the reviewed behavior.
   
   2. `IcebergReflection`: a helper that returns the effective `FileIO` class 
for a location. For a `ResolvingFileIO` it invokes `io(location)` and inspects 
the delegate Iceberg actually instantiates, including the fallback to 
`HadoopFileIO` when the scheme's `FileIO` cannot be loaded or initialized, so a 
table that resolves to `GCSFileIO` stays eligible. Reflection failures fail 
closed.
   
   AND 
   
   - Two end-to-end tests of `ResolvingFileIO` delegate resolution and write 
planning. One uses an unparseable `gcs.channel.read.chunk-size-bytes`, which 
fails `GCSFileIO.initialize` on Iceberg versions before 1.10 and is ignored at 
initialization on 1.10+; the expectation is version-aware. In CI the pre-1.10 
profiles lack the Google authentication classes, so `GCSFileIO` never 
constructs there and the test passes through the class-load fallback. Direct 
coverage of the initialization-failure path therefore remains unverified in CI; 
it holds by source inspection of 1.5.2 and 1.8.1.


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