HippoBaro opened a new pull request, #9831: URL: https://github.com/apache/arrow-rs/pull/9831
# Which issue does this PR close? <!-- We generally require a GitHub issue to be filed for all bug fixes and enhancements and this helps us generate change logs for our releases. You can link an issue to this PR using the GitHub syntax. --> - Spawn off from #9653 - Contributes to #9731 # Rationale for this change <!-- Why are you proposing this change? If this is already explained clearly in the issue then this section is not needed. Explaining clearly why changes are proposed helps reviewers understand your changes and offer better suggestions for fixes. --> See #9731 # What changes are included in this PR? Represent definition and repetition levels as `LevelData`/`LevelDataRef` with `Absent`, `Materialized`, and `Uniform` variants, and thread this through Arrow level generation, CDC chunking, and the generic column writer. Uniform level runs, such as required fields and all-null pages, can now be encoded without materializing dense `Vec<i16>` buffers. Add bulk run support to `LevelEncoder`/`RleEncoder` so repeated levels are encoded in amortized O(1) after the RLE warmup, while preserving histogram, row count, null count, page splitting, and CDC chunk accounting. # Are these changes tested? <!-- We typically require tests for all PRs in order to: 1. Prevent the code from being accidentally broken by subsequent changes 2. Serve as another way to document the expected behavior of the code If tests are not included in your PR, please explain why (for example, are they covered by existing tests)? --> All tests passing. Coverage exercises bulk RLE level encoding, compact/uniform `LevelData` slicing and writer roundtrips across Parquet v1/v2, and CDC/Arrow writer behavior including all-null and nested-level cases. # Are there any user-facing changes? <!-- If there are user-facing changes then we may require documentation to be updated before approving the PR. If there are any breaking changes to public APIs, please call them out. --> None. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
