mbutrovich opened a new pull request, #2528:
URL: https://github.com/apache/datafusion-comet/pull/2528
## Rationale for this change
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I was inspired by [Russell's recent
talk](https://www.youtube.com/watch?v=kJaD0WuQ1Bg) and wanted to visit the
abstraction layer at which Comet integrates with Iceberg. We have the
`iceberg_compat` codepath for Iceberg integration, but this requires code
changes in Iceberg to integrate with partition reader factories. Instead, this
prototype works at the `FileScanTask` layer after planning. This prototype
starts us toward a path of fully-native Iceberg scans to match our Parquet
logic with `native_datafusion` scans without any changes in Iceberg code.
## What changes are included in this PR?
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- New `CometIcebergNativeScanExec` node on the Scala side.
- Use reflection to extract scan properties, mostly `FileScanTask`s and
serialize to native code.
- New `IcebergScanExec` on native side that uses `FileScanTask`s to perform
reads in `iceberg-rust`.
## How are these changes tested?
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New `CometIcebergNativeSuite`.
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