py-1.35.1
pola-rs/polarspy-1.35.1Oct 30, 2025by github-actions[bot]
AI Summary
Python Polars 1.35.1 is a patch release fixing critical bugs in the SQL interface, group-by dynamic iterators, and predicate pushdown functionality.
Key Highlights
- Fix for SQL interface logical NOT operator behavior
- Fixes for group_by_dynamic iterator with multiple chunks
- Performance improvements for rolling moment windows and IPC reads
- BYTE_ARRAY backed Decimals in Parquet support
New Features
- BYTE_ARRAY backed Decimals in Parquet
- allow_empty flag to item
- glimpse to return a DataFrame
Full Release Notes
## 🚀 Performance improvements - Don't recompute full rolling moment window when NaNs/nulls leave the window (#25078) - Skip filtering scan IR if no paths were filtered (#25037) - Optimize ipc stream read performance (#24671) ## ✨ Enhancements - Support BYTE\_ARRAY backed Decimals in Parquet (#25076) - Allow `glimpse` to return a `DataFrame` (#24803) - Add `allow_empty` flag to `item` (#25048) ## 🐞 Bug fixes - The `SQL` interface should use logical, not bitwise, behaviour for unary "NOT" operator (#25091) - Fix panic if scan predicate produces 0 length mask (#25089) - Ensure SQL table alias resolution checks against CTE aliases on fallback (#25071) - Panic in `group_by_dynamic` with `group_by` and multiple chunks (#25075) - Minor improvement to internal `is_pycapsule` utility function (#25073) - Fix panic when using struct field as join key (#25059) - Allow broadcast in `group_by` for `ApplyExpr` and `BinaryExpr` (#25053) - Fix field metadata for nested categorical PyCapsule export (#25052) - Block predicate pushdown when `group_by` key values are changed (#25032) - Group-By aggregation problems caused by `AmortSeries` (#25043) - Don't push down predicates passed inserted cache nodes (#25042) - Allow for negative time in `group_by_dynamic` iterator (#25041) ## 📖 Documentation - Fix typo in public dataset URL (#25044) ## 🛠️ Other improvements - Disable recursive CSPE for now (#25085) - Change group length mismatch error to `ShapeError` (#25004) - Update toolchain (#25007) Thank you to all our contributors for making this release possible! @Kevin-Patyk, @Liyixin95, @alexander-beedie, @coastalwhite, @kdn36, @nameexhaustion, @orlp, @r-brink, @ritchie46 and @stijnherfst