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Support negative indexing for the "length" parameter of list.slice

enhancementNew feature or an improvement of an existing featureNew feature or an improvement of an existing feature

Status: Open.

#26540 In pola-rs/polars;

· conjuncts opened on Feb 12, 2026

Panic when calling <code>df.transpose()</code> on a dataframe with List columns

A-panicArea: code that results in panic exceptionsArea: code that results in panic exceptions

bugSomething isn't workingSomething isn't working

needs triageAwaiting prioritization by a maintainerAwaiting prioritization by a maintainer

pythonRelated to Python PolarsRelated to Python Polars

Status: Open.

#26538 In pola-rs/polars;

· DeflateAwning opened on Feb 11, 2026

<code>@deprecated()</code> Does Not Issue Warning When Under <code>@deprecate_renamed_parameter()</code>

acceptedReady for implementationReady for implementation

internalAn internal refactor or improvementAn internal refactor or improvement

P-lowPriority: lowPriority: low

pythonRelated to Python PolarsRelated to Python Polars

Status: Open.

#26536 In pola-rs/polars;

· Kevin-Patyk opened on Feb 11, 2026

dictionary_page_offset can be null for native polars-generated parquet files despite having dictionary pages

A-io-parquetArea: reading/writing Parquet filesArea: reading/writing Parquet files

bugSomething isn't workingSomething isn't working

needs triageAwaiting prioritization by a maintainerAwaiting prioritization by a maintainer

pythonRelated to Python PolarsRelated to Python Polars

Status: Open.

#26531 In pola-rs/polars;

· sfc-gh-jkossmann opened on Feb 11, 2026

MIT license not recognized in GitHub

documentationImprovements or additions to documentationImprovements or additions to documentation

Status: Open.

#26529 In pola-rs/polars;

· CosmicAnalogue465 opened on Feb 11, 2026

Feature request: Support Custom File Object Stores

A-dtype-objectArea: object data typeArea: object data type

enhancementNew feature or an improvement of an existing featureNew feature or an improvement of an existing feature

Status: Open.

#26510 In pola-rs/polars;

· iiLaurens opened on Feb 10, 2026

Dtype check not working for assert frame (not) equal

acceptedReady for implementationReady for implementation

bugSomething isn't workingSomething isn't working

P-highPriority: highPriority: high

pythonRelated to Python PolarsRelated to Python Polars

testRelated to the test suiteRelated to the test suite

Status: Open.

#26507 In pola-rs/polars;

· BCxP-Tobias opened on Feb 9, 2026

Multiple parametrized tests are failing when <code>POLARS_AUTO_NEW_STREAMING=1</code>

A-streamingRelated to the streaming engineRelated to the streaming engine

bugSomething isn't workingSomething isn't working

needs triageAwaiting prioritization by a maintainerAwaiting prioritization by a maintainer

pythonRelated to Python PolarsRelated to Python Polars

testRelated to the test suiteRelated to the test suite

Status: Open.

#26505 In pola-rs/polars;

· dsprenkels opened on Feb 9, 2026

Common subplan elimination is pessimized by filters

A-optimizerArea: plan optimizationArea: plan optimization

acceptedReady for implementationReady for implementation

enhancementNew feature or an improvement of an existing featureNew feature or an improvement of an existing feature

performancePerformance issues or improvementsPerformance issues or improvements

Status: Open.

#26502 In pola-rs/polars;

· orlp opened on Feb 9, 2026

Streaming implementation for grouped AsOf join

A-streamingRelated to the streaming engineRelated to the streaming engine

enhancementNew feature or an improvement of an existing featureNew feature or an improvement of an existing feature

Status: Open.

#26500 In pola-rs/polars;

· dsprenkels opened on Feb 9, 2026

Feature request: Support explicit dtype mapping and type promotion in <code>pl.scan_parquet</code> cast_options, and parity for <code>pl.read_parquet</code>

A-io-parquetArea: reading/writing Parquet filesArea: reading/writing Parquet files

enhancementNew feature or an improvement of an existing featureNew feature or an improvement of an existing feature

Status: Open.

#26496 In pola-rs/polars;

· SimpleZion opened on Feb 9, 2026

Move async executor from <code>polars-stream</code> to <code>polars-async</code> crate

internalAn internal refactor or improvementAn internal refactor or improvement

P-goalPriority: aligns with long-term Polars goalsPriority: aligns with long-term Polars goals

Status: Open.

#26493 In pola-rs/polars;

· nameexhaustion opened on Feb 9, 2026