# Polars 1.13.0 — Python Polars 1.13.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2024-11-12
- Version: 1.13.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.13.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.13.0

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'.

---

- **changed** — Improve DataFrame.sort().limit/top_k performance
- **changed** — Improve cloud scan performance
- **fixed** — Fix quadratic 'with_columns' behavior
- **changed** — Improve hive partition pruning with datetime predicates from SQL
- **changed** — Allow for arbitrary skips in Parquet Dictionary Decoding
- **changed** — Rechunk in DataFrame.rows if needed
- **changed** — Dispatch Parquet Primitive PLAIN decoding to faster kernels when possible
- **changed** — Use faster iteration in 'starts_with'/'ends_with'
- **changed** — Improve branchless Parquet Prefiltering
- **changed** — Reduce size of IdxVec from 24 to 16 bytes
- **added** — Try to support native SAP HANA driver via read_database
- **added** — Implement max/min methods for dtypes
- **changed** — Improve n_chunks typing
- **added** — Identify inefficient use of Python string removeprefix, removesuffix, and zfill in map_elements
- **changed** — Automatically use boto3 / google-auth if installed when scanning cloud
- **added** — Identify inefficient use of Python string replace in map_elements
- **added** — Parallel IPC sink for the new streaming engine
- **added** — Add SQL support for RIGHT JOIN and fix an issue with wildcard aliasing
- **added** — Add show_graph to display a GraphViz plot for expressions
- **changed** — Streamline use of predicates connected by & with IEJoin (join_where)

##### 🚀 Performance improvements

- Improve `DataFrame.sort().limit/top_k` performance (#19731)
- Improve cloud scan performance (#19728)
- Fix quadratic 'with\_columns' behavior (#19701)
- Improve hive partition pruning with datetime predicates from SQL (#19680)
- Allow for arbitrary skips in Parquet Dictionary Decoding (#19649)
- Reorder conditions in is\_leap\_year (#19602)
- Rechunk in DataFrame.rows if needed (#19628)
- Dispatch Parquet Primitive PLAIN decoding to faster kernels when possible (#19611)
- Use faster iteration in 'starts\_with'/'ends\_with' (#19583)
- Branchless Parquet Prefiltering (#19190)
- Reduce size of IdxVec from 24 -> 16 bytes (#19550)

##### ✨ Enhancements

- Try to support native SAP HANA driver via `read_database` (#19733)
- Implement max/min methods for dtypes (#19494)
- Improve `n_chunks` typing (#19727)
- Improve hive partition pruning with datetime predicates from SQL (#19680)
- Identify inefficient use of Python string `removeprefix`, `removesuffix`, and `zfill` in `map_elements` (#19672)
- Automatically use boto3 / google-auth if installed when scanning cloud (#19677)
- Identify inefficient use of Python string `replace` in `map_elements` (#19668)
- Parallel IPC sink for the new streaming engine (#19622)
- Add SQL support for `RIGHT JOIN`, fix an issue with wildcard aliasing (#19626)
- Add show\_graph to display a GraphViz plot for expressions (#19365)
- Streamline use of predicates connected by `&` with IEJoin (`join_where`) (#19552)
- Support use of `is_between` range predicate with IEJoin operations (`join_where`) (#19547)

##### 🐞 Bug fixes

- Use `cls` for `to_python` (#19726)
- Fix validation for inner and left join when join\_nulls unflaged (#19698)
- SQL `ELSE` clause should be implicitly `NULL` when omitted (#19714)
- Improve `n_chunks` typing (#19727)
- Ensure `NoDataError` raised consistently between engines for Excel reads (#19712)
- In group\_by\_dynamic, period and every were getting applied in reverse order for the window upper boundary (#19706)
- Only allow `list.to_struct` to be elementwise when width is fixed (#19688)
- Make Array arithmetic ops fully elementwise (#19682)
- Address inconsistency with use of Python types in frame-level `cast` (#19657)
- Update line-splitting logic in batched CSV reader (#19508)
- Fix incorrect lazy schema for `explode()` in `agg()` (#19629)
- Fix fill null types (#19656)
- Fix filter incorrectly pushed past struct unnest when unnested column name matches upper column name (#19638)
- Fix typing for SchemaDefinition (#19647)
- Ensure `mean_horizontal` raises on non-numeric input (#19648)
- Reorder conditions in is\_leap\_year (#19602)
- Copy height in .vstack() for empty dataframes (#19641) (#19642)
- Correct wildcard and input expansion for some more functions (#19588)
- Allow `.struct.with_fields` inside `list.eval` (#19617)
- Sortedness was incorrectly being preserved in dt.offset\_by when offsetting by non-constant durations in the timezone-naive case (#19616)
- Fix incorrect `scan_parquet().with_row_index()` with non-zero slice or with streaming collect (#19609)
- Fix mask and validity confusion in Parquet String decoding (#19614)
- Parquet decoding of nested dictionary values (#19605)
- Do not attempt to load default credentials when `credential_provider` is given (#19589)
- Fix gather len in group-by state (#19586)
- Added input validation for `explode` operation in the array namespace (#19163)
- Improve error message (#19546)
- Fix predicate pushdown into inequality joins (#19582)
- Correct categorical namespace error message (#19558)
- Fix performance regression for sort/gather on list/array columns (#19564)
- Ignore quoted newlines when skipping lines in CSV (#19543)
- Incorrect gather for FixedSizeList with outer validity but no inner validities (#19489)
- Make Duration parsing fallible and not panic (#19490)

##### 📖 Documentation

- Revise and rework user-guide/expressions (#19360)
- Update Excel page of user guide to refer to

_[Truncated at 4000 characters — full notes: https://github.com/pola-rs/polars/releases/tag/py-1.13.0]_