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🚀 Performance improvements

  • Optimise BytecodeParser usage from warn_on_inefficient_map (#23809)
  • Lower extend_constant to the streaming engine (#23824)
  • Lower pl.repeat to streaming engine (#23804)
  • Remove redundant clone (#23771)

✨ Enhancements

  • Lower rle_id to a native streaming node (#23894)
  • Pass endpoint_url loaded from CredentialProviderAWS to scan/write_delta (#23812)
  • Dispatch scan_iceberg to native by default (#23912)
  • Lower unique_counts and value_counts to streaming engine (#23890)
  • Support initializing from __arrow_c_schema__ protocol in pl.Schema (#23879)
  • Better handle broken local package environment in show_versions (#23885)
  • Implement dt.days_in_month function (#23119)
  • Making Expr.rolling_*_by methods available to pl.Series (#23742)
  • Fix errors on native scan_iceberg (#23811)
  • Reinterpret binary data to fixed size numerical array (#22840)
  • Make rolling_map serializable (#23848)
  • Ensure CachingCredentialProvider returns copied credentials dict (#23817)
  • Change typing for .remote() from LazyFrameExt to LazyFrameRemote (#23825)
  • Implement repeat_by for Array and Null (#23794)
  • Add DeprecationWarning on passing physical ordering to Categorical (#23779)
  • Pre-filtered decode and row group skipping with Iceberg / Delta / scans with cast options (#23792)
  • Update BytecodeParser opcode awareness for upcoming Python 3.14 (#23782)

🐞 Bug fixes

  • Categorical namespace functions fail on Enum columns (#23925)
  • Properly set sumwise complete on filter for missing columns (#23877)
  • Restore Arrow-FFI-based Python\<->Rust conversion in pyo3-polars (#23881)
  • Group By with filters (#23917)
  • Fix read_csv ignoring Decimal schema for header-only data (#23886)
  • Ensure collect() native Iceberg always scans latest when no snapshot_id is given (#23907)
  • Writing List(Array) columns to JSON without panic (#23875)
  • Fill Iceberg missing fields with partition values if present in metadata (#23900)
  • Create file for streaming sink even if unspawned (#23672)
  • Update cloud testing environment (#23908)
  • Parquet filtering on multiple RGs with literal predicate (#23903)
  • Incorrect datatype passed to libc::write (#23904)
  • Properly feature gate TZ_AWARE_RE usage (#23888)
  • Improve identification of "non group-key" aggregates in SQL GROUP BY queries (#23191)
  • Spawning tokio task outside reactor (#23884)
  • Correctly raise DuplicateError on asof_join with suffix="" (#23864)
  • Fix errors on native scan_iceberg (#23811)
  • Fix index out of bounds panic filtering parquet (#23850)
  • Fix error on empty range requests (#23844)
  • Fix handling of hive partitioning hive_start_idx parameter (#23843)
  • Allow encoding of pl.Enum with smaller physicals (#23829)
  • Filter sorted flag from physical in CategoricalChunked (#23827)
  • Remove accidental todo! in repeat node (#23822)
  • Make meta.pop operate on Expr only (#23808)
  • Stack overflow in DslPlan serde (#23801)
  • Clear credentials cached in Python when rebuilding object store (#23756)
  • Datetime selectors with mixed timezone info (#23774)
  • Support i128 in asof join (#23770)
  • Remove sleep for credential refresh (#23768)

📖 Documentation

  • Improve StackOverflow links in contributing guide (#23895)
  • Fix pyo3 documentation page link (#23839)
  • Document the pureness requirements of udfs (#23787)
  • Correct the name.* methods on their removal of aliases (#23773)

📦 Build system

  • Workaround for pyiceberg make requirements on Python 3.13 (#23810)
  • Add pyiceberg to dev dependencies (#23791)

🛠️ Other improvements

  • Ensure clippy and rustfmt run in CI when changing pyo3-polars (#23930)
  • Fix pyo3-polars proc-macro re-exports (#23918)
  • Rewrite evaluate_on_groups for .gather / .get (#23700)
  • Move Python C API to python-polars (#23876)
  • Improve/fix internal LRUCache implementation and move into "_utils" module (#23813)
  • Relax constraint on maximum Python version for numba (#23838)
  • Automatically tag PRs mentioning "SQL" with the appropriate label (#23816)
  • Update typos package (#23818)
  • Fix typos path (#23803)
  • Remove deserialize_with_unknown_fields (#23802)
  • Add pyiceberg to dev dependencies (#23791)
  • Remove old schema file (#23798)
  • Mark more tests as ready for cloud (#23743)
  • Reduce required deps for pyo3-polars (#23761)

Thank you to all our contributors for making this release possible! @JakubValtar, @Kevin-Patyk, @Liyixin95, @alexander-beedie, @cgevans, @cmdlineluser, @coastalwhite, @eitsupi, @gfvioli, @itamarst, @jimmmmmmmmmmmy, @kdn36, @math-hiyoko, @mcrumiller, @mpasa, @mrkn, @nameexhaustion, @orlp, @pka, @pomo-mondreganto, @ritchie46 and @stijnherfst

Source: README.md, updated 2025-08-06