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py-1.42.1

twentyhq/twentypy-1.42.1Jun 30, 2026by github-actions[bot]

AI Summary

This is a maintenance release for the Polars library focusing on performance optimizations for parquet metadata and small series sums, alongside critical bug fixes to prevent panics in sorting and filtering operations.

Key Highlights

  • Deprecation of `strict` parameter in `pl.concat`
  • Performance: Sampled resolve mode for multi-file parquet metadata
  • Performance: Speed up small dtype series sums
  • Bug Fixes: Fix panic on `scan_parquet` filter and decimal dynamic float cast
  • Bug Fixes: Fix projection pushdown panic on `select(len())`

Breaking Changes

  • Deprecate `strict` parameter of `pl.concat`, replace with new `how='horizontal_extend'`

New Features

  • Close ResourceWarning leaks in database tests
  • Expiry time loading for AWS `DeferredRefreshableCredentials`
  • Fix pyiceberg key dot HDFS prefix filter

Full Release Notes

## ⚠️ Deprecations

- Deprecate `strict` parameter of `pl.concat`, replace with new `how='horizontal_extend'` (#27965)

## 🚀 Performance improvements

- Add a sampled resolve mode for multi-file parquet metadata (#28111)
- Speed up small dtype series sums with a upcast sum kernel (#27958)
- Don't block on path expansion (#28073)

## ✨ Enhancements

- Close ResourceWarning leaks in database tests (#28066)

## 🐞 Bug fixes

- Incorrect sorted fast-path returning nan for grouped max (#28129)
- Fix panic on scan\_parquet filter of fixed-size binary column (#28122)
- Fix decimal dynamic float cast (#28126)
- Fix pyiceberg key dot HDFS prefix filter (#28109)
- Fix projection pushdown panic on `select(len())` after `groupby` (#28108)
- Fully resolve remaining `ResourceWarning` leaks in database/iceberg tests (#28107)
- Expiry time loading for AWS `DeferredRefreshableCredentials` (#28099)
- Close ResourceWarning leaks in database tests (#28066)
- Avoid panic on temporal extraction for datetime columns with nulls (#28054)
- Prevent panic in `replace` when `old`/`new` contain Expr or object dtype values (#27433)

## 📖 Documentation

- Fix dataset regression in the examples (#28131)
- Emphasize to generally not ever write Rust tests (#28082)
- Mention Polars skill in User Guide's LLM section (#28113)

## 🛠️ Other improvements

- Disallow usage of `tokio::spawn` in clippy (#28123)
- Improve `Makefile` with respect to `venv` robustness (#28110)
- Remove legacy prelude glob imports from leaf files (#28114)
- Skip pandas 3.0.4 due to `pd.TimeDelta` segfault (#28125)
- Update `mypy` to the new `2.x` release (#28116)
- Ensure `pyrefly` checks run as part of `make pre-commit` (#28095)
- Fix `test_select_explode_height_filter_order_by` failure when `POLARS_MAX_THREADS=2` (#28090)
- Add Morsel::height (#28060)

Thank you to all our contributors for making this release possible!
@0guban0v, @Kevin-Patyk, @TNieuwdorp, @alexander-beedie, @azimafroozeh, @dsprenkels, @kdn36, @nameexhaustion, @orlp, @raphaelroshan, @ritchie46 and @sar-cheng