xbattlax opened a new pull request, #2031:
URL: https://github.com/apache/iceberg-rust/pull/2031
## Summary
Implement size-based file scan task planning for iceberg-rust, addressing
issue #128.
## Changes
- Add `crates/iceberg/src/scan/bin_packing.rs` with:
- Greedy bin-packing algorithm with configurable lookback
- `BinPackingStream<S>` for async streaming (memory efficient)
- `CombinedScanTask` grouping for balanced parallel execution
- Weight calculation considering data size and file open costs
- Update `crates/iceberg/src/scan/context.rs`:
- File splitting based on `split_offsets` (Parquet row group boundaries)
- Fallback to byte-range splitting when offsets unavailable
- Optimized delete file handling (move ownership for last split)
- Update `crates/iceberg/src/scan/mod.rs`:
- Add `with_split_target_size()`, `with_split_open_file_cost()`,
`with_split_lookback()` builder methods
- Add `plan_tasks()` method returning `CombinedScanTaskStream`
- Update `crates/iceberg/src/scan/task.rs`:
- Add `CombinedScanTask` struct and `CombinedScanTaskStream` type
## Notes
This matches the Java Iceberg implementation's `TableScanUtil.planTasks()`
functionality:
- Large files are split into multiple tasks for parallel processing
- Small files are combined to reduce file open overhead
- Streaming implementation avoids collecting all tasks into memory
Closes #128
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