py-1.43.2

moeru-ai/airipy-1.43.2Aug 1, 2026by github-actions[bot]

AI Summary

This release focuses on performance optimizations and bug fixes for the Python Polars library, including deprecations for specific casting behaviors and improvements to schema inference and query planning.

Key Highlights

Pushdown `len()` to concat/union inputs for performance improvements.
Deprecates casts from `Categorical` to integer dtypes.
Adds `infer_schema_files` parameter to `scan_csv`.
Fixes multiple issues regarding Arrow C interop and Parquet reading.

New Features

Added `infer_schema_files` parameter to `scan_csv`.
Performance improvement by pushing down `len()` operations.
FutureWarning for `from_arrow` usage on ArrowStreamExportable.
Fixes for Arrow C interop binview offset and duplicate hive values.

Full Release Notes

## ⚠️ Deprecations

- Deprecate casts from `Categorical` to integer dtypes (#28525)
- Deprecate not setting the `plan_stage` argument in `show_graph()` (#28391)

## 🚀 Performance improvements

- Pushdown `len()` to concat/union inputs (#28570)

## ✨ Enhancements

- Issue FutureWarning on using `from_arrow` of ArrowStreamExportable (#28442)
- Add `infer_schema_files` parameter to `scan_csv` (#28440)

## 🐞 Bug fixes

- Properly propagate enum metadata for iceberg column mapping (#28580)
- Correctly write parquet field IDs for enums and categoricals (#28581)
- Fix arrow C interop binview offset (#28623)
- Fix duplicate hive values in hive pre-partition rewrite (#28621)
- Double-counted offset for Arrow export of sliced `Series(Array)` (#28602)
- Struct/List/Array equality handling in sort and join (#28601)
- More careful slice pushdown into joins (#28578)
- Preserve ordering in sliced unions (#28576)
- Drop input sortedness when casting to a string (#28574)
- Clear sortedness flags in `StringChunked` substring kernels (#28573)
- Bad mask handling when reading optional parquet column (#28547)
- Any operation on `Unknown(Int)` and `Unknown(Float)` should result in `Unknown(Float)` (#28545)
- Flip `nulls_last` after `Expr.reverse()` (#28572)
- Fix high blocking thread use in sink\_parquet with async local path (#28543)
- Serialize LazyFrames backed by bytes (#28568)
- Release GIL in `SQLContext.execute()` (#28549)
- Propagate `nulls_last` in `function_expr_sortedness` (#28544)
- Incorrect slicing when a join requires sorting (#28541)

## 🛠️ Other improvements

- Fix duckdb delta extension install collision (#28607)

Thank you to all our contributors for making this release possible!
@BitWeaverDev, @Matt711, @Samoilov2004, @borchero, @dancsi, @dsprenkels, @kdn36, @masumi-ryugo, @nameexhaustion and @ritchie46