# Polars 1.32.1 — Python Polars 1.32.1

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2025-08-06
- Version: 1.32.1
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.32.1
- Permalink: https://whatsnew.fyi/product/polars/releases/1.32.1

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** — Implement `dt.days_in_month` function
- **added** — Implement `repeat_by` for `Array` and `Null`
- **added** — Support initializing from `__arrow_c_schema__` protocol in `pl.Schema`
- **changed** — Lower `rle_id` to a native streaming node
- **changed** — Lower `extend_constant` to the streaming engine
- **changed** — Lower `pl.repeat` to streaming engine
- **changed** — Lower `unique_counts` and `value_counts` to streaming engine
- **changed** — Pass `endpoint_url` loaded from `CredentialProviderAWS` to `scan/write_delta`
- **changed** — Dispatch `scan_iceberg` to native by default
- **changed** — Making `Expr.rolling_*_by` methods available to `pl.Series`
- **changed** — Make `rolling_map` serializable
- **changed** — Change typing for `.remote()` from `LazyFrameExt` to `LazyFrameRemote`
- **changed** — Reinterpret binary data to fixed size numerical array
- **changed** — Update `BytecodeParser` opcode awareness for upcoming Python 3.14
- **deprecated** — Add DeprecationWarning on passing physical ordering to Categorical
- **fixed** — Categorical namespace functions fail on `Enum` columns
- **fixed** — Properly set sumwise complete on filter for missing columns
- **fixed** — Restore Arrow-FFI-based Python<->Rust conversion in pyo3-polars
- **fixed** — Group By with filters
- **fixed** — Fix `read_csv` ignoring Decimal schema for header-only data

##### 🚀 Performance improvements

- Optimise `BytecodeParser` usage from `warn_on_inefficient_map` (#23809)
- Lower extend\_constant to the streaming engine (#23824)
- Lower pl.repeat to streaming engine (#23804)
- Remove redundant clone (#23771)

##### ✨ Enhancements

- Lower `rle_id` to a native streaming node (#23894)
- Pass `endpoint_url` loaded from `CredentialProviderAWS` to `scan/write_delta` (#23812)
- Dispatch `scan_iceberg` to native by default (#23912)
- Lower `unique_counts` and `value_counts` to streaming engine (#23890)
- Support initializing from `__arrow_c_schema__` protocol in `pl.Schema` (#23879)
- Better handle broken local package environment in `show_versions` (#23885)
- Implement `dt.days_in_month` function (#23119)
- Making `Expr.rolling_*_by` methods available to `pl.Series` (#23742)
- Fix errors on native `scan_iceberg` (#23811)
- Reinterpret binary data to fixed size numerical array (#22840)
- Make `rolling_map` serializable (#23848)
- Ensure `CachingCredentialProvider` returns copied credentials dict (#23817)
- Change typing for `.remote()` from `LazyFrameExt` to `LazyFrameRemote` (#23825)
- Implement `repeat_by` for `Array` and `Null` (#23794)
- Add DeprecationWarning on passing physical ordering to Categorical (#23779)
- Pre-filtered decode and row group skipping with Iceberg / Delta / scans with cast options (#23792)
- Update `BytecodeParser` opcode awareness for upcoming Python 3.14 (#23782)

##### 🐞 Bug fixes

- Categorical namespace functions fail on `Enum` columns (#23925)
- Properly set sumwise complete on filter for missing columns (#23877)
- Restore Arrow-FFI-based Python\<->Rust conversion in pyo3-polars (#23881)
- Group By with filters (#23917)
- Fix `read_csv` ignoring Decimal schema for header-only data (#23886)
- Ensure `collect()` native Iceberg always scans latest when no `snapshot_id` is given (#23907)
- Writing List(Array) columns to JSON without panic (#23875)
- Fill Iceberg missing fields with partition values if present in metadata (#23900)
- Create file for streaming sink even if unspawned (#23672)
- Update cloud testing environment (#23908)
- Parquet filtering on multiple RGs with literal predicate (#23903)
- Incorrect datatype passed to libc::write (#23904)
- Properly feature gate TZ\_AWARE\_RE usage (#23888)
- Improve identification of "non group-key" aggregates in SQL `GROUP BY` queries (#23191)
- Spawning tokio task outside reactor (#23884)
- Correctly raise DuplicateError on asof\_join with suffix="" (#23864)
- Fix errors on native `scan_iceberg` (#23811)
- Fix index out of bounds panic filtering parquet (#23850)
- Fix error on empty range requests (#23844)
- Fix handling of hive partitioning `hive_start_idx` parameter (#23843)
- Allow encoding of `pl.Enum` with smaller physicals (#23829)
- Filter sorted flag from physical in CategoricalChunked (#23827)
- Remove accidental todo! in repeat node (#23822)
- Make `meta.pop` operate on `Expr` only (#23808)
- Stack overflow in `DslPlan` serde (#23801)
- Clear credentials cached in Python when rebuilding object store (#23756)
- Datetime selectors with mixed timezone info (#23774)
- Support i128 in asof join (#23770)
- Remove sleep for credential refresh (#23768)

##### 📖 Documentation

- Improve StackOverflow links in contributing guide (#23895)
- Fix `pyo3` documentation page link (#23839)
- Document the pureness requirements of udfs (#23787)
- Correct the `name.*` methods on their removal of aliases (#23773)

##### 📦 Build system

- Workaround for pyiceberg `make requirements` on Python 3.13 (#23810)
- Add pyiceberg to dev dependencies (#23791)

##### 🛠️ Other improvements

- Ensure `clippy` and `rustfmt` run in CI when changing `pyo3-polars` (#23930)
- Fix pyo3-polars proc-macro re-exports (#23918)
- Rewrite `evaluate_on_groups` for `.gather` / `.get` (#23700)
- Move Python C API to `python-polars` (#23876)
- Improve/fix internal `LRUCache` implementation and move into "\_utils" module (#23813)
- Relax constraint on maxi

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