pola-rs/polars: Python Polars 1.42.0

💥 Breaking changes Deprecate casts from string to temporal dtypes (#28056) ⚠️ Deprecations Deprecate casts from string to temporal dtypes (#28056) 🚀 Performance improvements Add bytes-based concurrency control for cloud IO (#27924) Stop flushing multiplexer on phase change (#28013) Prevent empty chunks from triggering copy in rechunk (#27953) Improve performance of struct unnest inside list eval on streaming (#27905) Eliminate filters with contradictory predicates (#27775) ✨ Enhancements Deprecate casts from string to temporal dtypes (#28056) Add naive out-of-core spilling to Polars (#27998) Add experimental strict mode (#28023) Optimize non-negative len and null_count comparisons (#28002) Optimize len and null_count comparisons (#27727) Support SQL's implicit JOIN syntax (#27890) Add Expr.is_sorted (#26708) Add suggestions in wrong api usage or mismatched column names (#27954) Add external object_store support for non-native schemes (#27871) Skip Delta files and parquet row groups using per-field struct statistics (#27887) Improve IR sortedness detection for with_row_index and explode (#27875) Add DataFrame.is_sorted() (#27870) Expose fixed-size rolling window expressions in Python visitor (#27108) Fix SchemaError using lazy HConcat->Sink (#27770) Add tiered multi-file parquet metadata resolver (#27720) Cache and shuffle DNS for cloud object_store (#27659) 🐞 Bug fixes Add a deprecation warning for .explode() without empty_as_null argument (#28040) Fix select(len()) incorrectly returned 0 when using scan_iceberg with pyiceberg as reader override (#28044) Ensure slice expr always observes input order (#28041) Fix projection pushdown with row index out of order (#28043) Fix cross-join predicates not applied when using sink_* functions (#28042) Grammar corrections (recommend to → recommend, allows to → allows using) (#28038) Ensure optimisations aren't omitted by cached IR nodes (#28004) Computed GROUP keys in SQL projections (#27989) Handle empty DataFrames in dt.truncate and dt.round (#26120) Address join alias state leakage in SQL CTEs (#27985) Support scanning file:// URIs with percent-encoded paths (#27876) Lower SQL [NOT] IN (subquery) to semi/anti join (#27888) Check for continuity across morsels in AsOf join node (#27461) Add test for projection pushdown with hconcat regression (#27937) Traverse caches only once in explain (#27939) Preserve null placement when collapsing sort.reverse() into single sort (#27918) Incorrect schema order for hstack in projection pushdown optimizer (#27920) Fix duplicated map_elements warning on streaming engine (#27919) Use block_in_place_on for calls which can come from executor thread (#27855) Mismatch in max_threads -> pipeline configuration (#27854) Keep maintain_order on sliced unique (#27852) Fix SchemaError using lazy HConcat->Sink (#27770) Fix incorrect projection height when selecting only literals (#27825) Select with expr slice and len gave incorrect len (#27824) Prevent import panic when environment variable set to unexpected value (#27831) 📖 Documentation New On-Prem release (#27979) Add note on OOM behavior on Kubernetes (#27972) Properly render backslashes in CSV eol_char docstrings (#27962) Add entry for DataFrame.is_sorted() (#27913) Clarify compat_level export docs (#27715) Add robots.txt disallowing stale docs and added sitemap for better SEO (#27901) Update Polars Spark comparison (#27873) Bump to patched version (#27851) Replace Typeform sign-up URL with new enterprise link (#27838) Correct wrong head call (#27848) Add Polars On-Prem 0.5.0 release (#27849) Correct onprem license helm values (#27847) Update connecting Polars Cloud to AWS documentation (#27823) Correct cost/connectivity sections (#27813) Add sections about egress (#27805) Tragic typo in On-Prem docs (#27804) 🛠️ Other improvements Add AI agent disclsoure (#28064) Bump memmap2 version (#28050) Update sqlparser dependency (#28021) Update pyo3 and rust-numpy to 0.29.0 (#27970) Add 2.0 branch as primary branch (#27978) Patch jemalloc-sys for Makefile bug (#27945) Restore Cargo.lock (#27964) Add test for projection pushdown with hconcat regression (#27937) Update deny.toml configuration (#27949) Doctest skip refactor and add hugging face rate limited tests (#27885) Run Pyrefly type-checker on source code (#27722) Bump Rust dependencies (#27874) Changes needed for Rust 0.54.x (#27853) Use Vec instead of PlHashMap for ProjectionInfo.map (#27856) Reduce codegen-units (#27835) Refactor to avoid unbound-name Pyright/Pyrefly errors (#27827) Thank you to all our contributors for making this release possible! @0guban0v, @April-Sonnet, @BitWeaverDev, @EndPositive, @JakubValtar, @Kevin-Patyk, @Liyixin95, @MarcoGorelli, @Matt711, @TNieuwdorp, @alexander-beedie, @ankane, @azimafroozeh, @cBournhonesque, @carnarez, @dsprenkels, @gautamvarmadatla, @kdn36, @nameexhaustion, @orlp, @ritchie46, @tolleybot, @toreerdmann, @uurl and @xixixao