Avoid alloc_zeroed in decompression (#22460)
Lower Expr.(n_)unique to group_by on streaming engine (#22420)
Chunk huge munmap calls (#22414)
Add single-key variants of streaming group_by (#22409)
Improve accumulate_dataframes_vertical performance (#22399)
Use optimize rolling_quantile with varying window sizes (#22353)
Dedicated rolling_skew kernel (#22333)
Call large munmap's in background thread (#22329)
New streaming group_by implementation (#22285)
Patch jemalloc to not purge huge allocs eagerly if we have background threads (#22318)
Turn on parallel=prefiltered by default for new streaming (#22190)
Add CSE to streaming groupby (#22196)
Speed-up new streaming predicate filtering (#22179)
Speedup new-streaming file row count (#22169)
Fix quadratic behavior when casting Enums (#22008)
Lower is_in to bitmap-output semi-join in new streaming engine (#21948)
Fast path for empty inner join (#21965)
Add native semi/anti join in new streaming engine (#21937)
Cache regex compilation globally (#21929)
Use views for binary hash tables and add single-key binary variant (#21872)
Avoid rechunking in gather (#21876)
Switch ahash for foldhash (#21852)
Put THP behind feature flag (#21853)
Enable THP by default (#21829)
Improve join performance for expanding joins (#21821)
Use binary_search instead of contains in business-day functions (#21775)
Implement linear-time rolling_min/max (#21770)
Improve InputIndependentSelect by delegating to InMemorySourceNode (#21767)
Enable common subplan elimination across plans in collect_all (#21747)
Allow elementwise functions in recursive lowering (#21653)
Add primitive single-key hashtable to new-streaming join (#21712)
Remove unnecessary black_boxes in Kahan summation (#21679)
Box large enum variants (#21657)
Improve join performance for new-streaming engine (#21620)
Pre-fill caches (#21646)
Optimize only a single cache input (#21644)
Collect parquet statistics in one contiguous buffer (#21632)
Update Cargo.lock (mainly for zstd 1.5.7) (#21612)
Don't maintain order when maintain_order=False in new streaming sinks (#21586)
Pre-sort groups in group-by-dynamic (#21569)
Provide a fallback skip batch predicate for constant batches (#21477)
Parallelize the passing in new streaming multiscan (#21430)
Toggle projection pushdown for eager rolling (#21405)
Fix pathologic rolling + group-by performance and memory explosion (#21403)
Add sampling to new-streaming equi join to decide between build/probe side (#21197)
Reduce sharing in stringview arrays in new-streaming equijoin (#21129)
Implement native Expr.count() on new-streaming (#21126)
Speed up list operations that use amortized_iter() (#20964)
Use Cow as output for rechunk and add rechunk_mut (#21116)
Reduce arrow slice mmap overhead (#21113)
Reduce conversion cost in chunked string gather (#21112)
Enable prefiltered by default for new streaming (#21109)
Enable parquet column expressions for streaming (#21101)
Deduplicate buffers again in stringview concat kernel (#21098)
Add dedicated concatenate kernels (#21080)
Rechunk only once during join probe gather (#21072)
Speed up from_pandas when converting frame with multi-index columns (#21063)
Change default memory prefetch to MADV_WILLNEED (#21056)
Remove cast to boolean after comparison in optimizer (#21022)
Split last rowgroup among all threads in new-streaming parquet reader (#21027)
Recombine into larger morsels in new-streaming join (#21008)
Improve list.min and list.max performance for logical types (#20972)
Ensure count query select minimal columns (#20923)

✨ Enhancements

Support grouping by pl.Array (#22575)
Preserve exception type and traceback for errors raised from Python (#22561)
Use fixed-width font in streaming phys plan graph (#22540)
Highlight nodes in streaming phys plan graph (#22535)
Support BinaryOffset serde (#22528)
Show physical stage graph (#22491)
Add structure for dispatching iceberg to native scans (#22405)
Add SQL support for checking array values with IN and NOT IN expressions (#22487)
Add more IRBuilder utils (#22482)
Support DataFrame and Series init from torch Tensor objects (#22177)
Add RoundMode for Decimal and Float (#22248)
Inform users that IO error path file name can be expanded with POLARS_VERBOSE=1 (#22427)
Make streaming dispatch public (#22347)
Add rolling_kurtosis (#22335)
Support Cast in IO plugin predicates (#22317)
Add .sort(nulls_last=True) to booleans, categoricals and enums (#22300)
Add rolling min/max for temporals (#22271)
Support literal:list agg (#22249)
Support implode + agg (#22230)
Dispatch scans to new-streaming by default (#22153)
Improved expression autocomplete for IPython, Jupyter, and Marimo (#22221)
Expose FunctionIR::FastCount in the python visitor (#22195)
Add SPLIT_PART string function to the SQL interface (#22158)
Allow scalar expr in Expr.diff (#22142)
Support additional unsigned int aliases in the SQL interface (#22127)
Add STRING_TO_ARRAY function to the SQL interface (#22129)
Add dt.is_business_day (#21776)
Add support for Int128 parsing/recognition to the SQL interface (#22104)
Allow sinking to abstract python io and fs classes (#21987)
Add add_alp_optimize_exprs to IRBuilder (#22061)
Add cat.slice (#21971)
Support growing schema if line lenght increases during csv schema inference (#21979)
Replace thread unsafe GilOnceCell with Mutex (#21927)
Support modified dsl in file cache (#21907)
Add support for io-plugins in new-streaming (#21870)
Add PartitionParted (#21788)
Add DoubleEndedIterator for CatIter (#21816)
Minor improvements to EXPLAIN plan output (#21822)
Add polars_testing folder with relevant files and add_series_equal!() functionality (#21722)
Allow to use repeat_by with (nested) lists and structs (#21206)
Add support for rolling_(sum/min/max) for booleans through casting (#21748)
Support multi-column sort for all nested types and nested search-sorted (#21743)
Add lazy sinks (#21733)
Add PartitionByKey for new streaming sinks (#21689)
Fix replace flags (#21731)
Add mkdir flag to sinks (#21717)
Enable joins on list/array dtypes (#21687)
Add a config option to specify the default engine to attempt to use during lazyframe calls (#20717)
Support all elementwise functions in IO plugin predicates (#21705)
Stabilize Enum datatype (#21686)
Support Polars int128 in from arrow (#21688)
Use FFI to read dataframe instead of transmute (#21673)
Enable new streaming memory sinks by default (#21589)
Cloud support for new-streaming scans and sinks (#21621)
Add len method to arr (#21618)
Closeable files on unix (#21588)
Add new PartitionMaxSize sink (#21573)
Implement unpack_dtypes() functionality with unit tests (#21574)
Support engine callback for LazyFrame.profile (#21534)
Dispatch new-streaming CSV negative slice to separate node (#21579)
Add NDJSON source to new streaming engine (#21562)
Add lossy decoding to read_csv for non-utf8 encodings (#21433)
Add 'nulls_equal' parameter to is_in (#21426)
Improve numeric stability rolling_{std, var, cov, corr} (#21528)
IR Serde cross-filter (#21488)
Support writing Time type in json (#21454)
Activate all optimizations in sinks (#21462)
Add AssertionError variant to PolarsError in polars-error (#21460)
Pass filter to inner readers in multiscan new streaming (#21436)
Implement i128 -> str cast (#21411)
Version DSL (#21383)
Make user facing binary formats mostly self describing (#21380)
Filter hive files using predicates in new streaming (#21372)
Add negative slicing to new streaming multiscan (#21219)
Pub-licize Expr DSL Function enums (#20421)
Implement sorted flags for struct series (#21290)
Support reading arrow Map type from Delta (#21330)
Add a dedicated remove method for DataFrame and LazyFrame (#21259)
Expose include_file_paths to python visitor (#21279)
Implement merge_sorted for struct (#21205)
Add positive slice for new streaming MultiScan (#21191)
Don't take in rewriting visitor (#21212)
Add SQL support for the DELETE statement (#21190)
Add row index to new streaming multiscan (#21169)
Improve DataFrame fmt in explain (#21158)
Add projection pushdown to new streaming multiscan (#21139)
Implement join on struct dtype (#21093)
Use unique temporary directory path per user and restrict permissions (#21125)
Enable new streaming multiscan for CSV (#21124)
Environment POLARS_MAX_CONCURRENT_SCANS in multiscan for new streaming (#21127)
Multi/Hive scans in new streaming engine (#21011)
Add linear_spaces (#20941)
Implement merge_sorted for binary (#21045)
Hold string cache in new streaming engine and fix row-encoding (#21039)
Support max/min method for Time dtype (#19815)
Implement a streaming merge sorted node (#20960)
Automatically use temporary credentials API for scanning Unity catalog tables (#21020)
Add negative slice support to new-streaming engine (#21001)
Allow for more RG skipping by rewriting expr in planner (#20828)
Rename catalog schema to namespace (#20993)
Add functionality to create and delete catalogs, tables and schemas to Unity catalog client (#20956)
Improved support for KeyboardInterrupts (#20961)
Extract timezone info from python datetimes (#20822)
Add hint for POLARS_AUTO_USE_AZURE_STORAGE_ACCOUNT_KEY to error message (#20942)
Filter Parquet pages with ParquetColumnExpr (#20714)

🐞 Bug fixes

Resolve get() SchemaMismatch panic (#22350)
Panic in group_by_dynamic on single-row df with group_by (#22597)
Add new_streaming feature to polars crate (#22601)
Consistently use Unix epoch as origin for dt.truncate (except weekly buckets which start on Mondays) (#22592)
Fix interpolate on dtype Decimal (#22541)
CSV count rows skipped last line if file did not end with newline (#22577)
Make nested strict casting actually strict (#22497)
Make replace and replace_strict mapping use list literals (#22566)
Allow pivot on Time column (#22550)
Fix error when providing CSV schema with extra columns (#22544)
Panic on bitwise op between Series and Expr (#22527)
Multi-selector regex expansion (#22542)
Streaming outer join coalesce bug (#22530)
Bug in .unique() followed by .slice() (#22471)
Fix error reading parquet with datetimes written by pandas (#22524)
Fix schema_overrides not taking effect in NDJSON (#22521)
Fold flags and verify scalar correctness in apply (#22519)
Invalid values were triggering panics instead of returning null in dt.to_date / dt.to_datetime (#22500)
Incorrectly dropped sort after unique for some queries (#22489)
Fix incorrect ternary agg state with mixed columns and scalars (#22496)
Make replace and replace_strict properly elementwise (#22465)
Fix index out of bounds panic on parquet prefiltering (#22458)
Integer underflow when checking parquet UTF-8 (#22472)
Add implementation for array.get with idx overflow (#22449)
Deprecate str. collection functions with flat strings and mark as elementwise (#22461)
Deprecate flat list.gather and mark as elementwise (#22456)
Inform users that IO error path file name can be expanded with POLARS_VERBOSE=1 (#22427)
Reading of reencoded categorical in Parquet (#22436)
Last thread in parquet predicate filter oob (#22429)
Ensure at least one column projected for AnonymousScan (#22411)
Fix rust -> python -> rust for map_batches (#22407)
Fix chaining pl.lit(<list>) with .list.get(pl.col(...)) (#22367)
Panic when visualizing streaming physical plan with joins (#22404)
Fix incorrect filter after LazyFrame.rename().select() (#22380)
Fix select(len()) performance regression (#22363)
Don't leak state during prefill CSE cache (#22341)
Maintain float32 type in partitioned group-by (#22340)
Resolve streaming panic on multiple merge_sorted (#22205)
Fix ndjson nested types (#22325)
Fix nested datetypes in ndjson (#22321)
Check matching lengths for pl.corr (#22305)
Move type coercion for pl.duration to planner (#22304)
Check dtype to avoid panic with mixed types in min/max_horizontal (#21857)
Coalesce correct column for new streaming full join (#22301)
Don't collect NaN from Parquet Statistics (#22294)
Set revmap for empty AnyValue to Series (#22293)
Add an __all__ entry to internal type definition module (#22254)
Too-strict SQL UDF schema validation (#20202)
Datetime parser was incorrectly parsing 8-digit fractional seconds when format specified to expect 9 (#22180)
Expr.over() returning List type when DataFrame is empty (#22201)
Deprecate using is_in with 2 equal types and mark as elementwise (#22178)
Duplicate key column name in streaming group_by due to CSE (#22280)
Raise ColumnNotFoundError for missing columns in join_where (#22268)
Parquet filters for logical types and operations (#22253)
Ensure floating-point accuracy in hist (#22245)
Fix str.to_integer panics for certain inputs (#22243)
Check matching key datatypes for new streaming joins (#22247)
Incorrect length BinaryArray/ListBuilder (#22227)
Incorrect condition on empty inner join fast path (#22208)
Fallback predicate filter for min=max with is_in (#22213)
Don't panic for LruCachedFunc for size=0 (#22215)
Writing masked out list values to json (#22210)
Deadlock in streaming distributor (#22207)
Implode in agg (#22197)
Reduce GIL hold time for IO plugins in new-streaming (#22186)
Enhance predicate validation and cast safety in join_where (#22112)
Handle Parquet with compressed empty DataPage v2 (#22172)
Schema error during lowering (#22175)
Rewrite unroll of overlapping groups to mitigate out of range index panic (#22072)
Incorrect rounding for very large/small numbers (#22173)
Allow set input to list.set_* operations (#22163)
Deadlock in join due to rayon nested task-stealing (#22159)
Mark Expr.repeat_by as elementwise (#22068)
Fix csv serializer panic by supporting ScalarColumn in as_single_chunk (#22146)
Raise an error if a number doesn't have associated unit in duration strings (#22035)
Add i128 as supertype to boolean (#22138)
Add broadcasts and error messages for many elementwise operations (#22130)
Throw error for n=0 on list.gather_every (#22122)
Throw error for unsupported rolling operations (#22121)
Error on unequal length str.to_integer arguments (#22100)
Make bottom interval closed in hist (#22090)
Avoiding panic with striptime for out-of-bounds dates (#21208)
Join revmaps for categoricals in merge_sorted (#21976)
Fix glob expansion matching extra files (#21991)
Ensure SQL dot-notation for nested column fields resolves correctly (#22109)
Parquet filter performance regression from multiscan dispatch (#22116)
Panic in GroupBySinkState::into_source with empty locals (#22095)
Without the new_streaming feature, Engine::Auto always select in memory engine (#22074)
Fix to_integer panicing on invalid base (#22052)
Panic for unequal length ewm_mean_by args (#22093)
Add scalarity checks to pl.repeat (#22088)
Type check n parameter of pl.repeat (#22071)
Mark bitwise_{count,leading,trailing}_{ones,zeros} as elementwise (#22044)
Mark pl.*_ranges functions correctly as element-wise (#22059)
Correctly type check pl.arctan2 (#22060)
Mark pl.business_day_count as elementwise (#22055)
Mark str.to_decimal properly as non-elementwise (#22040)
Documented return type for bin.encode and bin.decode (#22022)
Output name for AExpr::Len (#22041)
Copy exprs from sink (#22029)
Revert #22017 and improve block(_in_place)_on doc comment (#22031)
Remove outdated depth warning (#22030)
Expression pl.concat was incorrectly marked as elementwise (#22019)
Use block_in_place_on to start streaming (#22017)
Panic on empty aggregation in streaming (#22016)
Error instead of panick for invalid durations in dt.offset_by() and dt.round() (#21982)
Raise error instead of silently appending NULL in NDJSON parsing (#21953)
Ensure AV is static before pushing to row buffer (#21967)
Deadlock in new-streaming multiplexer (#21963)
Release GIL in collect_with_callback (#21941)
Panic in new RegexCache (#21935)
Type hint of cs.exclude() is SelectorType instead of Expr (#21892)
Allow pivot on empty frame for all integer index dtypes (#21890)
Null panic on decimal aggregate (#21873)
Join with categoricals on new-streaming engine (#21825)
Fix div 0 partitioned group-by (#21842)
Incorrect quote check in CSV parser (#21826)
Respect header separator in sink_csv (#21814)
Deprecation of streaming=False (#21813)
Fix collect_all type-coercion (#21810)
Memory leaks in SharedStorage (#21798)
Make None refer to uncompressed in sink_ipc (#21786)
Fix lazy schema for truediv ops involving List/Array dtypes (#21764)
Fix error due to race condition in file cache (#21753)
Clear NaNs due to zero-weight division in rolling var/std (#21761)
Allow init from BigQuery Arrow data containing ExtensionType cols with irrelevant metadata (#21492)
Disallow cast from boolean to categorical/enum (#21714)
Don't check sortedness in join_asof when 'by' groups supplied, but issue warning (#21724)
Incorrect multithread path taken for aggregations (#21727)
Disallow cast to empty Enum (#21715)
Fix list.mean and list.median returning Float64 for temporal types (#21144)
Incorrect (FixedSize)ListArrayBuilder gather implementation (#21716)
Always fallback in SkipBatchPredicate (#21711)
New streaming multiscan deadlock (#21694)
Ensure new-streaming join BuildState is correct even if never fed morsels (#21708)
IO plugin; support empty iterator (#21704)
Support nulls in multi-column sort (#21702)
Window function check length of groups state (#21697)
Support 128 sum reduction on new streaming (#21691)
IPC round-trip of list of empty view with non-empty bufferset (#21671)
Variance can never be negative (#21678)
Incorrect loop length in new-streaming group by (#21670)
Right join on multiple columns not coalescing left_on columns (#21669)
Casting Struct to String panics if n_chunks > 1 (#21656)
FixFuture attached to different loop error on read_database_uri (#21641)
Fix deadlock in cache + hconcat (#21640)
Properly handle phase transitions in row-wise sinks (#21600)
Enable new streaming memory sinks by default (#21589)
Always use global registry for object (#21622)
Check enum categories when reading csv (#21619)
Unspecialized prefiltering on nullable arrays (#21611)
Take into account scalar/partitioned columns in DataFrame::split_chunks (#21606)
Bad null handling in unordered row encoding (#21603)
Fix deadlock in new streaming CSV / NDJSON sinks (#21598)
Bad view index in BinaryViewBuilder (#21590)
Fix CSV count with comment prefix skipped empty lines (#21577)
New streaming IPC enum scan (#21570)
Several aspects related to ParquetColumnExpr (#21563)
Don't hit parquet::pre-filtered in case of pre-slice (#21565)
Categorical min/max panicking when string cache is enabled (#21552)
Don't encode IPC record batch twice (#21525)
Respect rewriting flag in Node rewriter (#21516)
Correct skip batch predicate for partial statistics (#21502)
Make the Parquet Sink properly phase aware (#21499)
Don't divide by zero in partitioned group-by (#21498)
Create new linearizer between rowwise new streaming sink phases (#21490)
Don't drop rows in sinks between new streaming phases (#21489)
Incorrect lazy schema for Expr.list.diff (#21484)
Fix unwrap None panic when filtering delta with missing columns (#21453)
Use stable sort for rolling-groupby (#21444)
Method dt.ordinal_day was returning UTC results as opposed to those on the local timestamp (#21410)
Use Kahan summation for rolling sum kernels. Fix numerical stability issues (#21413)
Add scalar checks for n and fill_value parameters in shift (#21292)
Upcast small integer dtypes for rolling sum operations (#21397)
Don't silently produce null values from invalid input to pl.datetime and pl.date (#21013)
Allow duration multiplied w/ primitive to propagate in IR schema (#21394)
Struct arithmetic broadcasting behavior (#21382)
Prefiltered optional plain primitive kernel (#21381)
Panic when projecting only row index from IPC file (#21361)
Properly update groups after gather in aggregation context (#21369)
Mark test as may_fail_auto_streaming (#21373)
Properly set fast_unique in EnumBuilder (#21366)
Rust test race condition (#21368)
Fix height validation in hstack_mut was bypassed when adding to empty frame (#21335)
Fix unequal DataFrame column heights from parquet hive scan with filter (#21340)
Ensure ASCII ellipsis fits in column width (#21275)
Fix ColumnNotFound error selecting len() after semi/anti join (#21355)
Merge Parquet nested and flat decoders (#21342)
Incorrect atomic ordering in Connector (#21341)
Method dt.offset_by was discarding month and year info if day was included in offset for timezone-aware columns (#21291)
Fix pickling polars.col on Python versions <3.11 (#21333)
Fix duplicate column names after join if suffix already present (#21315)
Skip Batches Expression for boolean literals (#21310)
Fix performance regression for eager join_where (#21308)
Fix incorrect predicate pushdown for predicates referring to right-join key columns (#21293)
Panic in to_physical for series of arrays and lists (#21289)
Fix inconsistency between code and comment (#21294)
Resolve deadlock due to leaking in Connector recv drop (#21296)
Incorrect result for merge_sorted with lexical categorical (#21278)
Add Int128 path for join_asof (#21282)
Categorical min/max returning String dtype rather than Categorical (#21232)
Checking overflow in Sliced function (#21207)
Adding a struct field using a literal raises InvalidOperationError (#21254)
Return nulls for is_finite, is_infinite, and is_nan when dtype is pl.Null (#21253)
Properly implement and test Skip Batch Predicate (#21269)
Infinite recursion when broadcasting into struct zip_outer_validity (#21268)
Deadlock due to bad logic in new-streaming join sampling (#21265)
Incorrect result for top_k/bottom_k when input is sorted (#21264)
UTF-8 validation of nested string slice in Parquet (#21262)
Raise instead of panicking when casting a Series to a Struct with the wrong number of fields (#21213)
Defer credential provider resolution to take place at query collection instead of construction (#21225)
Do not panic in strptime() if format ends with '%' (#21176)
Raise error instead of panicking for unsupported SQL operations (#20789)
Projection of only row index in new streaming IPC (#21167)
Fix projection count query optimization (#21162)
Fix Expr.over applying scale incorrectly for Decimal types (#21140)
Fix IO plugin predicate with failed serialization (#21136)
Correctly implement take_(opt_)chunked_unchecked for structs (#21134)
Restore printing backtraces on panics (#21131)
Use microseconds for Unity catalog datetime unit (#21122)
Fix incorrect output height for SQL SELECT COUNT(*) FROM (#21108)
Validate/coerce types for comparisons within join_where predicates (#21049)
Fix minor histogram issues (#21088)
Do not auto-init credential providers if credential fetch returns error (#21090)
Fix join_where incorrectly dropping transformations on RHS of equality expressions (#21067)
Quadratic allocations when loading nested Parquet column metadata (#21050)
Invalidate sortedness flag when sorting from pl.Categorical to pl.Categorical("lexical") (#21044)
Calling top_k on list type panics (#21043)
Fix rolling on empty DataFrame panicking (#21042)
Fix set_tbl_width_chars panicking with negative width (#20906)
Fix merge_sorted producing incorrect results or panicking for some logical types (#21018)
Fix all-null list aggregations returning Null dtype (#20992)
Ensure scalar-only with_columns are broadcasted on new-streaming (#20983)
Improve SQL interface behaviour when INTERVAL is not a fixed duration (#20958)
Add Arrow Float16 conversion DataType (#20970)
Feature-gate ClosedWindow (#20963)
Revert length check of patterns in str.extract_many() (#20953)
Add maintain order for flaky new-streaming test (#20954)
Allow for respawning of new streaming sinks (#20934)
Ensure Function name correctness in cse (#20929)

📖 Documentation

Improve join documentation (#22556)
Fix typo in structs page (#22504)
Add multiplexing page (#22426)
Improve interpolation documentation to clarify behavior of null values (#22274)
Add user guide section on working with Sheets in Colab (#22161)
Update distributed engine docs (#22128)
Add Polars Cloud release notes (#22021)
Remove trailing space in settings POLARS_CLOUD_CLIENT_ID (#21995)
Fix typo (#21954)
Fix 'pickleable' typo in docs (#21938)
Document polars_stream::run_query (#21928)
Change ctx to compute=ctx for all remote query examples (#21930)
Add sources and sinks to user-guide (#21780)
Add skrub to ecosystem.md (#21760)
Make python/rust getting-started consistent and clarify performance risk of infer_schema_length=None (#21734)
Update Polars Cloud interactive workflow examples (#21609)
Add cloud api reference to Ref guide (#21566)
Fix typo (#21554)
Move llm page under misc (#21550)
Polars Cloud docs (#21548)
Fix initial selector example (#21321)
Add pandas strictness API difference (#21312)
Add logo to Ask AI (#21261)
Fix docs for Catalog (#21252)
AI widget again (#21257)
Revert plugin (#21250)
Add kappa ask ai widget (#21243)
Improve Arrow key feature description (#21171)
Correct small typo in FileInfo (#21150)
Correct Arrow misconception (#21053)
Document IO plugins (#20982)
Ensure set_sorted description references single-column behavior (#20709)

📦 Build system

Update object_store to 0.12 (#22512)
Speed up CI by running a few more tests in parallel (#21057)

🛠️ Other improvements

Remove confusing error context calling .collect(_eager=True) (#22602)
Fix test_truncate_path test case (#22598)
Unify function flags into 1 bitset (#22573)
Display the operation behind in-memory-map (#22552)
Add extend_each_repeated to builders (#22549)
Improve zip state update (#22526)
Don't store name/dtype in grouper (#22525)
Add structure for dispatching iceberg to native scans (#22405)
Make node names in new-streaming consistent with plan visualization (#22477)
Update the cloud eligibility check (#22459)
Remove unused reduction code (#22462)
Pin to explicit macOS version in code coverage (#22432)
Add test for implode + over (#22437)
Fix CI by removing use_legacy_dataset (#22438)
Only use pytorch index-url for pytorch package (#22355)
Install pytorch for 3.13 on Windows (#22356)
Improve new-streaming multiscan physical plan visualization (#22415)
Make interpolate fix more robust (#22421)
Fix interpolate test (#22417)
Reduce hot table size in debug mode (#22400)
Replace intrinsic with non-intrinsic (#22401)
Improve code re-use for groupby and delete unused code (#22382)
Make streaming dispatch public (#22347)
Update rustc to 'nightly-2025-04-19' (#22342)
Update mozilla-actions/sccache-action (#22319)
Introduce and use UnifiedScanArgs (#22314)
Purge old parquet and scan code (#22226)
Add an __all__ entry to internal type definition module (#22254)
Move missing / cast columns policies from polars-stream to polars-plan (#22277)
Add online skew/kurtosis algorithm for future use in rolling kernels (#22261)
Use more logical delta definition in var/cov calcs (#22256)
Add Polars Cloud 0.0.7 release notes (#22223)
Change format name from list to implode (#22240)
Make other parallel parquet modes filter afterwards (#22228)
Close async reader issues (#22224)
Add BinaryArrayBuilder (#22225)
Remove old MultiScanExec for in-memory (#22184)
Remove unused multiscan code (#22183)
Separate FunctionOptions from DSL calls (#22133)
Dispatch new-streaming CSV source to updated multiscan (#21994)
Dispatch new-streaming IO plugin source to updated multiscan (#22009)
Undeprecate backward_fill and forward_fill (#22156)
Dispatch new-streaming IPC source to updated multiscan (#21993)
Schema callback for multi file reader interface (#22152)
Handle conversion of Duration specially in pyir (#22101)
Deprecate duplicate backward_fill and forward_fill interface (#22083)
Solve clippy lints for 1.86 (#22102)
Remove rust exclusive MaxBound and MinBound fill strategies (#22063)
Simplify HashKeys with code re-use (#22037)
Dispatch new-streaming Parquet source to updated multiscan (#21992)
Dispatch new-streaming NDJSON source to updated multiscan (#21990)
Add updated multiscan pipeline (#21925)
Fix slicing 0-width morsels on new streaming (#21940)
Change dynamic literals to be separate category (#21849)
Add bridge for multi scan (#21863)
Add POLARS_TIMEOUT_MS for timing out slow Polars tests (#21887)
Remove FileType in favor of ReaderCapabilities for new-streaming multiscan (#21881)
Disable --dist loadgroup in pytest (#21885)
Fix refcount assert being messed up by pytest assertion magic (#21884)
Remove FileSink from polars-parquet (#21865)
Add new FileReader / FileReaderBuilder interfaces for multi file (#21839)
Mark with_row_index_mut as unsafe (#21841)
Add ops components for refactored multiscan (#21812)
Add env vars to configure new-streaming buffer sizes (#21818)
Add MorselLinearizer convenience wrapper (#21811)
Add a slice enum to polars-utils (#21795)
Pass around StreamingExecutionState, containing num_pipelines and ExecutionState (#21796)
Add allocation-free empty/default to SharedStorage (#21768)
Remove variance numerical stability hack (#21749)
Only use chrono_tz timezones in hypothesis testing (#21721)
Remove order check from flaky test (#21730)
Add sinks into the DSL before optimization (#21713)
Add missing test case for #21701 (#21709)
Remove old-streaming from engine argument (#21667)
Add as_phys_any to PrivateSeries for downcasting (#21696)
Use FFI to read dataframe instead of transmute (#21673)
Work around typos ignore bug (#21672)
Added Test For datetime_range Nanosecond Overflow (#21354)
Update to edition 2024 (#21662)
Update rustc (#21647)
Remove once_cell in favor of std equivalents (#21639)
Remove unused flag (#21642)
Support object from chunks (#21636)
Rename block_on_potential_spawn to block_in_place_on (#21627)
Push versioned docs on workflow dispatch (#21630)
Fail docs early (#21629)
Check major/minor in docs (#21626)
Add docs workflow (#21624)
Introduce Writeable and AsyncWriteable (#21599)
Add test for 21581 (#21617)
Remove even more parquet multiscan handling (#21601)
Add freeze_reset to the builders (#21587)
Remove multiscan handling from new streaming parquet source (#21584)
Add opt_gather and extend_nulls to builders (#21582)
Avoid downloading full parquet when initializing new streaming parquet source (#21580)
Prepare skeleton for partitioning sinks (#21536)
Add SeriesBuilder and DataFrameBuilder (#21567)
Use a oneshot channel for unrestricted_row_count, fix panic in new-streaming negative slice (#21559)
Don't take ownership of IRplan in new streaming engine (#21551)
Refactor code for re-use by streaming NDJSON source (#21520)
Simplify the phase handling of new streaming sinks (#21530)
Map Polars AssertionError to pyo3's AssertionError and improve macro flexibility (#21495)
Improve IPC sink node parallelism (#21505)
Use tikv-jemallocator (#21486)
Rename 'join_nulls' parameter to 'nulls_equal' in join functions (#21507)
Add remove_one to VarState for use in rolling variance (#21504)
Move rolling to polars-compute (#21503)
Remove Growable in favor of ArrayBuilder (#21500)
Add ArrayBuilders (#21370)
Introduce a Sink Node trait in the new streaming engine (#21458)
Add test for rolling stability sort (#21456)
Add test for empty .is_in predicate filter (#21455)
Test for unique length on multiple columns (#21418)
Dispatch ChunkedArray serialization to Series (IPC) serialization (#21422)
Refactor ordinal_day (#21416)
Move dsl related code under dsl/* (#21367)
Move storage of hive partitions to DataFrame (#21364)
Feature gate merge sorted in new streaming engine (#21338)
Remove new streaming old multiscan (#21300)
Add tests for fixed open issues (#21185)
Try to mimic all steps (#21249)
Require version for POLARS_VERSION (#21248)
Fix docs (#21246)
Remove unused file (#21240)
Improve hash join build sample implementation (#21236)
Add use_field_init_shorthand = true to rustfmt (#21237)
Don't mutate arena by default in Rewriting Visitor (#21234)
Disable the TraceMalloc allocator (#21231)
Use distributor channel in new-streaming CSV reader and prepare scanning routine for true parallel reading (#21189)
Add feature gate to old streaming deprecation warning (#21179)
Install seaborn when running remote benchmark (#21168)
Add test for equality filters in Parquet (#21114)
Add various tests for open issues (#21075)
Move python dsl and builder_dsl code to dsl folder (#21077)
Organize python related logics in polars-plan (#21070)
Improve binary dispatch (#21061)
Skip physical order test (#21060)
Add force_populate_read for debugging pagefault performance problems (#21054)
Fix new ruff lints (#21040)
Use string-based keyboard interrupt panic detection (#21030)
Add make fix for running cargo clippy --fix (#21024)
Spawn threads on our rayon pool in new-streaming (#21012)
Add tests for resolved issues (#20999)
Update code coverage workflow to use macos-latest runners (#20995)
Remove unnecessary unsafe around warning function (#20985)
Remove unused arrow file (#20974)
Remove thiserror dependency (#20979)
Deprecate the old streaming engine (#20949)
Move dt.replace tests to dedicated file, add "typing :: typed" classifier, remove unused testing function (#20945)
Extract merge sorted IR node (#20939)
Update copyright year (#20764)
Move Parquet deserialization to BitmapBuilder (#20896)
Also publish polars-python (#20933)
Remove verify_dict_indices_slice from main (#20928)

Thank you to all our contributors for making this release possible! @AH-Merii, @DavideCanton, @DeflateAwning, @EnricoMi, @GaelVaroquaux, @GiovanniGiacometti, @Jacob640, @JakubValtar, @Jesse-Bakker, @Julian-J-S, @Kevin-Patyk, @Liyixin95, @MarcoGorelli, @Matt711, @MaxJackson, @NathanHu725, @NeejWeej, @Shoeboxam, @YichiZhang0613, @aberres, @adamreeve, @alexander-beedie, @amotzop, @anath2, @arnabanimesh, @axellpadilla, @banflam, @borchero, @braaannigan, @brianmakesthings, @bschoenmaeckers, @cmdlineluser, @cnpryer, @coastalwhite, @d-reynol, @dependabot[bot], @dongchao-1, @edwinvehmaanpera, @eitsupi, @erikbrinkman, @etiennebacher, @florian-klein, @ghuls, @hemanth94, @henryharbeck, @itamarst, @jqnatividad, @jrycw, @kdn36, @kevinjqliu, @kgv, @lmmx, @lukemanley, @math-hiyoko, @mcrumiller, @mroeschke, @mullimanko, @nameexhaustion, @orlp, @petrosbar, @r-brink, @rgertenbach, @ritchie46, @sebasv, @siddharth-vi, @silannisik, @skritsotalakis, @stijnherfst, @taureandyernv, @thomasjpfan, @wence-, @ydagosto, @yiteng-guo, @zachlefevre and dependabot[bot]