# Polars 1.10.0 — Python Polars 1.10.0

- Product: Polars (https://whatsnew.fyi/product/polars)
- Vendor: Polars
- Date: 2024-10-20
- Version: 1.10.0
- Original notes: https://github.com/pola-rs/polars/releases/tag/py-1.10.0
- Permalink: https://whatsnew.fyi/product/polars/releases/1.10.0

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** — Make date_range / datetime_range approximately 10x faster for constant durations
- **changed** — Batch utf8-validation in csv with approximately 18% / 25% improvement on 1.9.0
- **changed** — Use two-pass algorithm for csv to ensure correctness and SIMDize more with approximately 17% improvement
- **added** — Add SQL support for bit_count and bitwise &, |, and xor operators
- **added** — Add credential provider utility classes for AWS, GCP
- **added** — Support decoding Float16 in Parquet
- **added** — Experimental credential_provider argument for scan_parquet
- **added** — Allow DeltaTable input to scan_delta and read_delta
- **added** — New quantile interpolation method and QUANTILE_DISC function in SQL
- **added** — Low level flight interface
- **added** — Improve list arithmetic support
- **added** — Add Expr.struct.unnest() as alias for Expr.struct.field("*")
- **added** — Add drop_empty_rows parameter for read_ods
- **added** — Add drop_empty_rows parameter for read_excel
- **added** — Quantile function in SQL
- **added** — Add Series::{first, last, approx_n_unique}
- **added** — Allow for rolling_*_by to use index count as window
- **changed** — Conserve Parquet SortingColumns for ints
- **changed** — Delay deserialization of python function until physical plan
- **added** — Add cum(_min/_max) for pl.Boolean
- **fixed** — Don't produce duplicate column names in Series.to_dummies

##### 🚀 Performance improvements

- Add/fix unordered row decode, change unordered format (#19284)
- Fast decision for Parquet dictionary encoding (#19256)
- Make date\_range / datetime\_range ~10x faster for constant durations (#19216)
- Batch utf8-validation in csv `18%` / `25%` on 1.9.0 (#19124)
- Use two-pass algorithm for csv to ensure correctness and SIMDize more `~17%` (#19088)

##### ✨ Enhancements

- Add SQL support for `bit_count` and bitwise `&`, `|`, and `xor` operators (#19114)
- Add credential provider utility classes for AWS, GCP (#19297)
- Support decoding Float16 in Parquet (#19278)
- Experimental `credential_provider` argument for `scan_parquet` (#19271)
- Allow DeltaTable input to scan\_delta and read\_delta (#19229)
- New quantile interpolation method \& QUANTILE\_DISC function in SQL (#19139)
- Conserve Parquet `SortingColumns` for ints (#19251)
- Low level flight interface (#19239)
- Improved list arithmetic support (#19162)
- Add Expr.struct.unnest() as alias for Expr.struct.field("\*") (#19212)
- Add 'drop\_empty\_rows' parameter for `read_ods` (#19202)
- Add 'drop\_empty\_rows' parameter for `read_excel` (#18253)
- Expose LTS CPU in show\_versions() (#19193)
- Check Python version when deserializing UDFs (#19175)
- Raise an error when users try to use Polars API in a fork()-without-execve() child (#19149)
- Quantile function in SQL (#18047)
- Improve scalar strict message (#19117)
- Add Series::{first, last, approx\_n\_unique} (#19093)
- Allow for rolling\_\*\_by to use index count as window (#19071)
- Delay deserialization of python function until physical plan (#19069)
- Add cum(\_min/\_max) for pl.Boolean (#19061)

##### 🐞 Bug fixes

- Don't produce duplicate column names in Series.to\_dummies (#19326)
- Use of `HAVING` outside of `GROUP BY` should raise a suitable SQLSyntaxError (#19320)
- More accurate `from_dicts` typing/signature (#19322)
- Fix empty array gather (#19316)
- Merge categorical rev-map in `unpivot` (#19313)
- DataFrame descending sorting by single list element (#19233)
- Fix cse union schema (#19305)
- Correctly load Parquet statistics for f16 (#19296)
- Error on invalid query (#19303)
- Fix enum scalar output (#19301)
- Fix list gather invalid fast path (#19299)
- Fix quoting style of decimal csv output (#19298)
- Don't vertically parallelize literal select (#19295)
- Fix struct reshape fast path (#19294)
- Also split on forward slashes during hive path inference on Windows (#19282)
- Don't cse `as_struct` (#19280)
- Only apply string parsing to String dtype (#19222)
- Make the SQLAlchemy connection check more robust (#19270)
- Ensure that `read_database` takes advantage of Arrow return from a `duckdb_engine` connection when using a SQLAlchemy `Selectable` (#19255)
- Compilation error missing use JsonLineReader (#19244)
- Don't remember Parquet statistics if filtered (#19248)
- Do not check dtypes of non-projected columns for parquet (#19254)
- Parquet predicate pushdown for `lit(_) !=` (#19246)
- Use all chunks in `Series` from arrow struct (#19218)
- Don't trigger row limit in array construction (#19215)
- Fix struct literals (#19214)
- Plotting was not interacting well with Altair schema wrappers (#19213)
- Fixing infer\_schema for DataType::Null (#19201)
- Migrate to PyO3 0.22 and released verion of rust-numpy crate (#19199)
- Add 'drop\_empty\_rows' parameter for `read_excel` (#18253)
- Don't unwrap() expansion (#19196)
- Properly handle non-nullable nested Parquet (#19192)
- Fix invalid list collection in expression engine (#19191)
- Fix use of "hidden\_columns" parameter in `write_excel` (#19029)
- Implement to\_arrow functionality properly for Arrays (#19077)
- Remove incorrect warning when using an `IO[bytes]` instance (#19154)
- Don't fail test if e.g. jax has been used first, since jax installs a fork handler that warns (#19178)
- Fix incorrect `(eq|ne)_missing` on List/Array types (#19155)
- Properly broadcast Struct when then validity (#19148)
- Allow partial name o

_[Truncated at 4000 characters — full notes: https://github.com/pola-rs/polars/releases/tag/py-1.10.0]_