# Polars 1.32.0 — Python Polars 1.32.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2025-08-01
- Version: 1.32.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.32.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.32.0

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** — Make Selector a concrete part of the DSL
- **changed** — Rework Categorical/Enum to use (Frozen)Categories
- **changed** — Lower Expr.slice to streaming engine
- **changed** — Lower any() and all() to streaming engine
- **changed** — Lower row-separable functions in streaming engine
- **changed** — Lower int_range(len()) to with_row_index
- **changed** — Rolling quantile lower time complexity
- **changed** — Use single-key optimization with Categorical
- **changed** — Enable Parquet expressions and dedup is_in values in Parquet predicates
- **changed** — Re-write join types during filter pushdown
- **changed** — Push more filters past joins
- **added** — Add Python-side caching for credentials and provider auto-initialization
- **added** — Expand on DataTypeExpr
- **added** — Add scalar checks to range expressions
- **added** — Expose POLARS_DOT_SVG_VIEWER to automatically dispatch to SVG viewer
- **added** — Implement mean function in arr namespace
- **added** — Implement vec_hash for List and Array
- **added** — Add unstable pl.row_index() expression
- **added** — Add Categories on the Python side
- **added** — Implement partitioned sinks for the in-memory engine
- **added** — Add arr.slice, arr.head and arr.tail methods to arr namespace

##### 🏆 Highlights

- Make `Selector` a concrete part of the DSL (#23351)
- Rework Categorical/Enum to use (Frozen)Categories (#23016)

##### 🚀 Performance improvements

- Lower Expr.slice to streaming engine (#23683)
- Elide bound check (#23653)
- Preserve `Column` repr in `ColumnTransform` operations (#23648)
- Lower any() and all() to streaming engine (#23640)
- Lower row-separable functions in streaming engine (#23633)
- Lower int\_range(len()) to with\_row\_index (#23576)
- Avoid double field resolution in with\_columns (#23530)
- Rolling quantile lower time complexity (#23443)
- Use single-key optimization with Categorical (#23436)
- Improve null-preserving identification for boolean functions (#23317)
- Improve boolean bitwise aggregate performance (#23325)
- Enable Parquet expressions and dedup `is_in` values in Parquet predicates (#23293)
- Re-write join types during filter pushdown (#23275)
- Generate PQ ZSTD decompression context once (#23200)
- Trigger cache/cse optimizations when multiplexing (#23274)
- Cache FileInfo upon DSL -> IR conversion (#23263)
- Push more filters past joins (#23240)
- Optimize `Bitmap::make_mut` (#23138)

##### ✨ Enhancements

- Add Python-side caching for credentials and provider auto-initialization (#23736)
- Expand on `DataTypeExpr` (#23249)
- Lower row-separable functions in streaming engine (#23633)
- Add scalar checks to range expressions (#23632)
- Expose `POLARS_DOT_SVG_VIEWER` to automatically dispatch to SVG viewer (#23592)
- Implement mean function in `arr` namespace (#23486)
- Implement `vec_hash` for `List` and `Array` (#23578)
- Add unstable `pl.row_index()` expression (#23556)
- Add Categories on the Python side (#23543)
- Implement partitioned sinks for the in-memory engine (#23522)
- Raise and Warn on UDF's without `return_dtype` set (#23353)
- IR pruning (#23499)
- Support min/max reducer for null dtype in streaming engine (#23465)
- Implement streaming Categorical/Enum min/max (#23440)
- Allow cast to Categorical inside list.eval (#23432)
- Support `pathlib.Path` as source for `read/scan_delta()` (#23411)
- Enable default set of `ScanCastOptions` for native `scan_iceberg()` (#23416)
- Pass payload in `ExprRegistry` (#23412)
- Support reading nanosecond/Int96 timestamps and schema evolved datasets in `scan_delta()` (#23398)
- Support row group skipping with filters when `cast_options` is given (#23356)
- Execute bitwise reductions in streaming engine (#23321)
- Use `scan_parquet().collect_schema()` for `read_parquet_schema` (#23359)
- Add dtype to str.to\_integer() (#22239)
- Add `arr.slice`, `arr.head` and `arr.tail` methods to `arr` namespace (#23150)
- Add `is_close` method (#23273)
- Drop superfluous casts from optimized plan (#23269)
- Added `drop_nulls` option to `to_dummies` (#23215)
- Support comma as decimal separator for CSV write (#23238)
- Don't format keys if they're empty in dot (#23247)
- Improve arity simplification (#23242)
- Allow expression input for `length` parameter in `pad_start`, `pad_end`, and `zfill` (#23182)

##### 🐞 Bug fixes

- Load `_expiry_time` from botocore `Credentials` in CredentialProviderAWS (#23753)
- Fix credential refresh logic (#23730)
- Fix `to_datetime()` fallible identification (#23735)
- Correct output datatype for `dt.with_time_unit` (#23734)
- Fix incorrect native Iceberg scan from tables with renamed/dropped columns/fields (#23713)
- Allow DataType expressions with selectors (#23720)
- Match output type to engine for `interpolate` on `Decimal` (#23706)
- Remaining bugs in `with_exprs_and_input` and pruning (#23710)
- Match output dtype to engine for `cum_sum_horizontal` (#23686)
- Field names for `pl.struct` in group-by (#23703)
- Fix output for `str.extract_groups` with empty string pattern (#23698)
- Match output type to engine for `rolling_map` (#23702)
- Moved passing `DeltaTable._storage_options` (#23673)
- Fix incorrect join on single Int128 column for in-memory engine (#23694)
- Match output field name to lhs for

_[Truncated at 4000 characters — full notes: https://github.com/pola-rs/polars/releases/tag/py-1.32.0]_