# Polars 1.24.0 — Python Polars 1.24.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2025-03-02
- Version: 1.24.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.24.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.24.0

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add lossy decoding to read_csv for non-utf8 encodings
- **added** — Add DataFrame.write_iceberg
- **added** — Add nulls_equal parameter to is_in
- **added** — Support writing Time type in json
- **added** — Add AssertionError variant to PolarsError in polars-error
- **changed** — Improve numeric stability in rolling_std, rolling_var, rolling_cov, rolling_corr
- **changed** — Rename join_nulls parameter to nulls_equal in join functions
- **changed** — Move rolling to polars-compute
- **changed** — Use tikv-jemallocator
- **fixed** — Categorical min/max panicking when string cache is enabled
- **fixed** — Don't encode IPC record batch twice
- **fixed** — Respect rewriting flag in Node rewriter
- **fixed** — Correct skip batch predicate for partial statistics
- **fixed** — Make the Parquet Sink properly phase aware
- **fixed** — Don't divide by zero in partitioned group-by
- **fixed** — Create new linearizer between rowwise new streaming sink phases
- **fixed** — Don't drop rows in sinks between new streaming phases
- **fixed** — Incorrect lazy schema for Expr.list.diff
- **fixed** — Duration Series arithmetic operations
- **fixed** — Fix unwrap None panic when filtering delta with missing columns

##### 🚀 Performance improvements

- Provide a fallback skip batch predicate for constant batches (#21477)
- Parallelize the passing in new streaming multiscan (#21430)

##### ✨ Enhancements

- Add lossy decoding to `read_csv` for non-utf8 encodings (#21433)
- Add `DataFrame.write_iceberg` (#15018)
- Add 'nulls\_equal' parameter to `is_in` (#21426)
- Improve numeric stability `rolling_{std, var, cov, corr}` (#21528)
- IR Serde cross-filter (#21488)
- Give priority to pycapsule interface in from\_dataframe (#21377)
- Support writing `Time` type in json (#21454)
- Activate all optimizations in sinks (#21462)
- Add `AssertionError` variant to `PolarsError` in `polars-error` (#21460)
- Pass filter to inner readers in multiscan new streaming (#21436)

##### 🐞 Bug fixes

- Categorical min/max panicking when string cache is enabled (#21552)
- Don't encode IPC record batch twice (#21525)
- Respect rewriting flag in Node rewriter (#21516)
- Correct skip batch predicate for partial statistics (#21502)
- Make the Parquet Sink properly phase aware (#21499)
- Don't divide by zero in partitioned group-by (#21498)
- Create new linearizer between rowwise new streaming sink phases (#21490)
- Don't drop rows in sinks between new streaming phases (#21489)
- Incorrect lazy schema for `Expr.list.diff` (#21484)
- Give priority to pycapsule interface in from\_dataframe (#21377)
- Duration Series arithmetic operations (#21425)
- Fix unwrap None panic when filtering delta with missing columns (#21453)
- Use stable sort for rolling-groupby (#21444)
- Throw exception if dataframe is too large to be compatible with Excel (#20900)
- Address regression with `read_excel` not handling URL paths correctly (#21428)

##### 📖 Documentation

- Fix typo (#21554)
- Correct typos and grammar in Python docstrings (#21524)
- Move llm page under misc (#21550)
- Polars Cloud docs (#21548)
- Add LazyFrame.remote docs entry (#21529)
- Specify that the key column must be sorted in ascending order in `merge_sorted` (#21501)
- Add Polars \& LLMs page to the user guide (#21218)
- Mention that `statistics=True` doesn't enable all statistics in `sink_parquet()` (#21434)

##### 🛠️ Other improvements

- Don't take ownership of IRplan in new streaming engine (#21551)
- Refactor code for re-use by streaming NDJSON source (#21520)
- Simplify the phase handling of new streaming sinks (#21530)
- Improve IPC sink node parallelism (#21505)
- Use tikv-jemallocator (#21486)
- Rename 'join\_nulls' parameter to 'nulls\_equal' in join functions (#21507)
- Move rolling to polars-compute (#21503)
- Remove Growable in favor of ArrayBuilder (#21500)
- Introduce a Sink Node trait in the new streaming engine (#21458)
- Add test for rolling stability sort (#21456)
- Add test for empty `.is_in` predicate filter (#21455)
- Test for unique length on multiple columns (#21418)

Thank you to all our contributors for making this release possible!
@Kevin-Patyk, @MarcoGorelli, @Matt711, @alexander-beedie, @banflam, @braaannigan, @coastalwhite, @dependabot[bot], @etiennebacher, @ghuls, @kevinjqliu, @lukemanley, @mcrumiller, @nameexhaustion, @orlp, @ritchie46, @stijnherfst, @thomasjpfan and [dependabot[bot]](https://github.com/apps/dependabot)