# Polars 1.11.0 — Python Polars 1.11.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2024-10-23
- Version: 1.11.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.11.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.11.0

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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- **changed** — Improve var/cov/corr performance
- **changed** — Reduce memcopy in parquet
- **changed** — Optimize array and list gather
- **changed** — Various Schema improvements for equality and init dtype checks
- **added** — AssumeRole support for AWS Credential Provider
- **added** — Added escape_regex operation to the str namespace and as a global function
- **changed** — Improve read_database_uri typing
- **fixed** — Allow .get(null) in groupby context
- **fixed** — Fix include_file_paths and with_row_index for streaming CSV scan
- **fixed** — Release GIL in gather_with_series() and friend
- **fixed** — Raise on data mismatch in str.json_decode
- **fixed** — Ensure Python version matches version used to serialize credential provider
- **fixed** — Capture groups should be ignored in replace_all when literal=True
- **fixed** — Ignore Parquet is_min_max_value_exact when set to true
- **fixed** — Projection pushdown was ignored by include_file_paths
- **added** — Expose group_by_dynamic in pyir
- **added** — Add AlignedBytes types
- **changed** — Improve error message for Zero-Field Structs with Parquet

##### 🚀 Performance improvements

- Improve var/cov/corr performance (#19381)
- Reduce memcopy in parquet (#19350)
- Optimize array and list gather (#19327)

##### ✨ Enhancements

- Various `Schema` improvements (equality/init dtype checks) (#19379)
- AssumeRole support for AWS Credential Provider (#19346)
- Added `escape_regex` operation to the `str` namespace and as a global function (#19257)
- Improve `read_database_uri` typing (#19334)

##### 🐞 Bug fixes

- Allow .get(null) in groupby context (#19401)
- Fix `include_file_paths` and `with_row_index` for streaming CSV scan (#19394)
- Flaky parametric parquet test (#19393)
- Release GIL in `gather_with_series()` and friend (#19383)
- Raise on data mismatch in `str.json_decode` (#19347)
- Ensure Python version matches version used to serialize credential provider (#19375)
- Capture groups should be ignored in replace\_all when literal=True (#19366)
- Ignore Parquet `is_{min,max}_value_exact` when set to `true` (#19344)
- Projection pushdown was ignored by `include_file_paths` (#19341)

##### 📖 Documentation

- Spurious import in example (#19398)
- Tiny correction post dask-expr (#19354)

##### 📦 Build system

- Revert PyO3 version back to `0.21` (#19376)

##### 🛠️ Other improvements

- Expose group\_by\_dynamic in pyir (#19385)
- Add `AlignedBytes` types (#19308)
- Remove unsued bytes->BytesIO conversion (#19369)
- Improve error message for Zero-Field Structs with Parquet (#19370)
- Reduce memcopy in parquet (#19350)

Thank you to all our contributors for making this release possible!
@alexander-beedie, @barak1412, @benrutter, @coastalwhite, @corwinjoy, @itamarst, @max-muoto, @nameexhaustion, @orlp, @ritchie46, @stinodego, @wence- and @wolfgang-noichl