# Polars 1.29.0 — Python Polars 1.29.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2025-04-30
- Version: 1.29.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.29.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.29.0

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** — Avoid alloc_zeroed in decompression
- **added** — Highlight nodes in streaming phys plan graph
- **added** — Show physical stage graph
- **added** — Add structure for dispatching iceberg to native scans
- **added** — Add SQL support for checking array values with IN and NOT IN expressions
- **added** — Support DataFrame and Series init from torch Tensor objects
- **added** — Add RoundMode for Decimal and Float
- **added** — Inform users that IO error path file name can be expanded with POLARS_VERBOSE=1
- **fixed** — Fix streaming outer join coalesce bug
- **fixed** — Remove redundant print statement in assert_frame_schema_equal()
- **fixed** — Fix bug in .unique() followed by .slice()
- **fixed** — Fix error reading parquet with datetimes written by pandas
- **fixed** — Fix schema_overrides not taking effect in NDJSON
- **fixed** — Fix fold flags and verify scalar correctness in apply
- **fixed** — Invalid values were triggering panics instead of returning null in dt.to_date / dt.to_datetime
- **fixed** — Ensure numpy isinstance check is lazy to avoid forcing the dependency
- **fixed** — Fix incorrectly dropped sort after unique for some queries
- **fixed** — Fix incorrect ternary agg state with mixed columns and scalars
- **fixed** — Make replace and replace_strict properly elementwise
- **fixed** — Fix index out of bounds panic on parquet prefiltering

##### 🚀 Performance improvements

- Avoid alloc\_zeroed in decompression (#22460)

##### ✨ Enhancements

- Highlight nodes in streaming phys plan graph (#22535)
- Show physical stage graph (#22491)
- Add structure for dispatching iceberg to native scans (#22405)
- Add SQL support for checking array values with `IN` and `NOT IN` expressions (#22487)
- Support `DataFrame` and `Series` init from torch `Tensor` objects (#22177)
- Add `RoundMode` for Decimal and Float (#22248)
- Inform users that IO error path file name can be expanded with POLARS\_VERBOSE=1 (#22427)

##### 🐞 Bug fixes

- Streaming outer join coalesce bug (#22530)
- Remove redundant print statement in `assert_frame_schema_equal()` (#22529)
- Bug in `.unique()` followed by `.slice()` (#22471)
- Fix error reading parquet with datetimes written by pandas (#22524)
- Fix `schema_overrides` not taking effect in NDJSON (#22521)
- Fold flags and verify scalar correctness in apply (#22519)
- Invalid values were triggering panics instead of returning ``null`` in `dt.to_date` / `dt.to_datetime` (#22500)
- Ensure numpy `isinstance` check is lazy (avoid forcing the dependency) (#22486)
- Incorrectly dropped sort after unique for some queries (#22489)
- Fix incorrect ternary agg state with mixed columns and scalars (#22496)
- Make `replace` and `replace_strict` properly elementwise (#22465)
- Fix index out of bounds panic on parquet prefiltering (#22458)
- Integer underflow when checking parquet UTF-8 (#22472)
- Add implementation for `array.get` with idx overflow (#22449)
- Deprecate `str.` collection functions with flat strings and mark as elementwise (#22461)
- Deprecate flat `list.gather` and mark as elementwise (#22456)
- Inform users that IO error path file name can be expanded with POLARS\_VERBOSE=1 (#22427)

##### 📖 Documentation

- Fix typo in structs page (#22504)

##### 🛠️ Other improvements

- Don't store name/dtype in grouper (#22525)
- Add structure for dispatching iceberg to native scans (#22405)
- Remove unused reduction code (#22462)
- Pin to explicit macOS version in code coverage (#22432)

Thank you to all our contributors for making this release possible!
@AH-Merii, @JakubValtar, @Julian-J-S, @Kevin-Patyk, @Liyixin95, @MarcoGorelli, @Matt711, @alexander-beedie, @brianmakesthings, @coastalwhite, @nameexhaustion, @orlp and @ritchie46