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Upgrade to DataFusion 55 - #274
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datafusion-python 55.0.0 is built on DataFusion 55.1, Arrow 59 and pyo3 0.29, so xarray-sql's extension moves to the same versions; its FFI table provider has to match the Python package's DataFusion. - ExecutionPlan gained apply_expressions; XarrayScanExec delegates to the scan it wraps. - TableReference moved out of datafusion::sql; it's in datafusion::common. - PyCapsule::new is deprecated; the provider capsule uses new_with_value, as datafusion-python's own FFI example does. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01NyN7idACeDMh94qrnFMu6h
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Linked Issues check |  |
Issue #272 requires caching batches for registered in-memory, non-lazy Dataset variables and invalidating the cache when the same table name is registered again. The supplied change summary shows only… |
Implement the #272 batch cache for eligible in-memory Dataset variables. Invalidate the cache on same-name registration. Add automated coverage for repeated scans and table replacement. |
| Docstring Coverage | |
Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the primary change: upgrading the project to DataFusion 55. Out of Scope Changes check The supplied change summary shows dependency upgrades and compatibility changes required to use DataFusion 55 with datafusion-python 55.0.0. The Rust toolchain change supports the DataFusion 55 build … Full details: Out of Scope Changes check
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Explanation
The supplied change summary shows dependency upgrades and compatibility changes required to use DataFusion 55 with datafusion-python 55.0.0. The Rust toolchain change supports the DataFusion 55 build requirement. No unrelated change is shown.
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Full details: Linked Issues check
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Explanation
Issue
#272requires caching batches for registered in-memory, non-lazy Dataset variables and invalidating the cache when the same table name is registered again. The supplied change summary shows only DataFusion, Arrow, PyO3, import, capsule, and Rust toolchain updates. It shows no cache or invalidation implementation. The PR identifies#275as the follow-up for#272.Resolution
Implement the
#272batch cache for eligible in-memory Dataset variables. Invalidate the cache on same-name registration. Add automated coverage for repeated scans and table replacement.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @Cargo.toml:
- Around line 25-26: Update the Pyodide cross-build environment and its Rust
toolchain to a version compatible with DataFusion 55.1.0, ensuring the wheel
build uses at least Rust 1.94.0. Keep the existing DataFusion dependency
versions unchanged.
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Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01NyN7idACeDMh94qrnFMu6h
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DataFusion 55 requires Rust 1.94, and Pyodide 314.0.7, the newest stable release, pins 1.93.0. The wasm build now uses whichever is newer; the smoke test still loads the wheel in Pyodide. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01NyN7idACeDMh94qrnFMu6h
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Fixes #272. **Stacked on #274** (DataFusion 55): review only the commits after #274's, and merge after #274. ## Why Every scan of a lazy xarray-sql table goes through `datafusion-ffi`, which costs about 1.5 ms per scan. On every scan it rebuilds the session, and on every partition's execution the task context, every registered function included (#273, a draft to re-file upstream). That cost is noise for one scan of a large Dataset. But DataFusion inlines a CTE or a view at every reference, so a query over small tables can scan them thousands of times. The GPT in the ML demos (#269) scans its tables 2,989 times in one forward pass, and this overhead was 6.7 s of the 9.2 s. ## What - `Context.from_dataset` converts a Dataset once, at registration, and registers it as a native DataFusion in-memory table, bypassing FFI, when the Dataset: - is already in memory (every variable is NumPy, per xarray's `Variable._in_memory`; not Dask or a lazily opened file); - is at most 64 MiB as long-form Arrow. The table has a partition per chunk, up to the CPU count, so chunking still sets parallelism. - Every other Dataset keeps the lazy table, with partition pruning, projection pushdown and exact statistics. - Mixed-dimension Datasets register each dimension group in their schema, as an in-memory table taken from `register_record_batches` under a placeholder name, which is then removed. The table itself is registered, not a view of it, so a query's plan scans the registered name; ddx needs that name to find the table it differentiates. - **Memory:** the table shares the Dataset's arrays rather than copying them. NumPy's buffers pass through `pa.array` and Arrow's C data interface into DataFusion unchanged, and partitions are contiguous row ranges, so no chunking forces a copy. The table adds its dimension columns, one value per row for each dimension. A Fortran-ordered array is copied once. ## Results | | before | after | |---|---:|---:| | `SELECT *` over a 1,040-row in-memory Dataset | 1.7 ms | 0.26 ms | | GPT forward loss (DataFusion 54, the same tables registered in memory) | 9.2 s | 2.5 s | | GPT training step through ddx, cached program | 1.17 s | 0.81 s | The GPT numbers come from registering the demo's tables with `register_record_batches`, which is what this change does. The demo itself can't run on this branch until ddxdb supports DataFusion 55. ## Tests - **New:** - a small in-memory Dataset becomes a native table and returns the same rows as the same Dataset read lazily; - a mixed-dimension Dataset registers native tables in its schema and leaves nothing extra in the catalog; - an in-memory Dataset over 64 MiB stays lazy; - the table shares the Dataset's memory under four chunkings: a change made in place shows in the next query, as it does for a lazy table. - **Changed:** the statistics and pruning tests (`test_stats.py`, and the duration-pruning test in `test_sql.py`) exercise the lazy table, so they now register Dask-backed Datasets (`ds.chunk()`). - `pytest -m "not integration"`: 510 passed, 277 skipped. mypy 1.11.2 is clean. 🤖 Generated with [Claude Code](https://claude.com/claude-code) https://claude.ai/code/session_01NyN7idACeDMh94qrnFMu6h <!-- This is an auto-generated comment: release notes by coderabbit.ai --> <!-- coderabbit-ai-generated:v1 --> ## Summary by CodeRabbit * **New Features** * Small, in-memory datasets that meet supported layout requirements can be queried through native tables; larger or chunked datasets continue to be read lazily. * Queries reflect in-place value changes to registered datasets. If missing-value positions change, register the dataset again for accurate results. * **Tests** * Expanded coverage for eager and lazy queries, dataset sizes and dimensions, shared value updates, and statistics. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Claude Opus 5.5 <[email protected]>
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Upgrades xarray-sql to DataFusion 55, to match datafusion-python 55.0.0. ddxdb is moving to the same version, and xarray-sql's FFI table provider has to be built against the Python package's DataFusion.
Changes
Python:
datafusion==55.0.0.Rust:
datafusionanddatafusion-ffi55.1 (55.2 resolves);arrowandarrow-flight59;pyo3andpyo3-build-config0.29.These are the versions datafusion-python 55.0.0 is built on.
API changes in DataFusion 55:
ExecutionPlanhas a new required method,apply_expressions.XarrayScanExecdelegates it to the scan it wraps.TableReferenceis no longer indatafusion::sql; it's imported fromdatafusion::common.pyo3 0.29:
PyCapsule::newis deprecated. The table provider's capsule now usesnew_with_value, as datafusion-python's own FFI table-provider example does.Testing
pytest -m "not integration": 503 passed, 277 skipped.cargo check --all-targetsis clean, with no warnings.cargo clippy --all-features --tests -- -D warningsandcargo fmt --check, with CI's rustfmt config, are clean (Rust 1.99 from nixpkgs).Follow-up
ddxdb>=0.3.3, which requiresdatafusion==54.0.0. That conflicts with this PR until a ddxdb built on DataFusion 55 is released.🤖 Generated with Claude Code
https://claude.ai/code/session_01NyN7idACeDMh94qrnFMu6h
Summary by CodeRabbit