# Polars 1.16.0 — Python Polars 1.16.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2024-11-29
- Version: 1.16.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.16.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.16.0

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'.

---

- **removed** — Remove note about guaranteed left join order
- **changed** — Expand more filters
- **changed** — Cache the DataFrame schema in get_column_index
- **added** — Enable creation of independently reusable Config instances
- **changed** — Improved error message on invalid Python Enum init
- **changed** — Improve Polars Enum dtype init from standard Python enums
- **added** — Add optimized row encoding for Decimals
- **added** — Add drop_nans method to DataFrame and LazyFrame
- **fixed** — Improve hist binning around breakpoints
- **fixed** — Fix invalid len due to projection pushdown selection of scalar
- **fixed** — Fix empty scalar agg type
- **fixed** — Improve binning in Series.hist with bin_count when all values are the same
- **fixed** — Less intrusive forking warnings
- **fixed** — Reading nullable sliced / masked Categoricals from Parquet
- **fixed** — Regression in hist panicking on out of bounds index
- **fixed** — Fix starts_with out of bounds
- **fixed** — Fix incorrect column order for parquet scan with hive columns in file
- **fixed** — Incorrectly gave list.len() for masked-out rows
- **fixed** — Bug fix in existing fast path for sorted series
- **fixed** — Incorrect collect_schema() for fill_null() after an aggregation expression in group-by context

##### 💥 Breaking changes

- Remove note about guaranteed left join order (#20048)

##### 🚀 Performance improvements

- Expand more filters (#20022)
- Cache the DataFrame schema in get\_column\_index (#20021)

##### ✨ Enhancements

- Enable creation of independently reusable `Config` instances (#20053)
- Improved error message on invalid Python `Enum` init (#20060)
- Improve Polars `Enum` dtype init from standard Python enums (#19997)
- Add optimized row encoding for Decimals (#20050)
- Add `drop_nans` method to DataFrame and LazyFrame (#20029)

##### 🐞 Bug fixes

- Improve `hist` binning around breakpoints (#20054)
- Fix invalid len due to projection pushdown selection of scalar (#20049)
- Fix empty scalar agg type (#20051)
- Improve binning in `Series.hist` with `bin_count` when all values are the same (#20034)
- Less intrusive forking warnings (#20032)
- Reading nullable sliced / masked Categoricals from Parquet (#20024)
- Regression in `hist` panicking on out of bounds index (#20016)
- Fix starts\_with out of bounds (#20006)
- Fix incorrect column order for parquet scan with hive columns in file (#19996)
- Incorrectly gave `list.len()` for masked-out rows (#19999)
- Bug fix in existing fast path for sorted series (#20004)
- Incorrect `collect_schema()` for `fill_null()` after an aggregation expression in group-by context (#19993)
- Fix `row_by_key` typing (#19888)

##### 📖 Documentation

- Remove note about guaranteed left join order (#20048)
- Fix broken links to user guide (#19989)

##### 📦 Build system

- Pin maturin (#20063)

Thank you to all our contributors for making this release possible!
@alexander-beedie, @coastalwhite, @gab23r, @lukemanley, @mcrumiller, @nameexhaustion, @ritchie46, @siddharth-vi, @stijnherfst and @stinodego