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Merge on ArrowDtype columns fails with ValueError when using multiple partitions

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12374 In dask/dask;

· phalvesmbai opened on May 7, 2026

'cumsum' results differ from 'cumsum' on a pure numpy array

array

bugSomething is brokenSomething is broken

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12359 In dask/dask;

· muttener opened on Apr 23, 2026

Understanding why nan_to_num does not accept keyword arguments

needs attentionIt's been a while since this was pushed on. Needs attention from the owner or a maintainer.It's been a while since this was pushed on. Needs attention from the owner or a maintainer.

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12350 In dask/dask;

· djhoese opened on Apr 8, 2026

pandas nightly is broken

dataframe

p2Affects more than a few users but doesn't prevent core functionsAffects more than a few users but doesn't prevent core functions

upstream

Status: Open.

#12337 In dask/dask;

· crusaderky opened on Apr 2, 2026

cholesky incorrect for complex dtype

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12335 In dask/dask;

· jcmgray opened on Apr 1, 2026

Performance report breaks alongside python 3.14

needs attentionIt's been a while since this was pushed on. Needs attention from the owner or a maintainer.It's been a while since this was pushed on. Needs attention from the owner or a maintainer.

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12329 In dask/dask;

· ArielDeVora opened on Mar 17, 2026

da.quantile with weights fails

bugSomething is brokenSomething is broken

Status: Open.

#12322 In dask/dask;

· joshua-gould opened on Mar 11, 2026

Seeking guidance on optimizing large-scale data processing in Python using Dask

discussionDiscussing a topic with no specific actions yetDiscussing a topic with no specific actions yet

needs infoNeeds further information from the userNeeds further information from the user

Status: Open.

#12319 In dask/dask;

· fx0espxor-hue opened on Mar 9, 2026

delayed function applied to an Array duplicates the whole dask graph on creation

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12318 In dask/dask;

· crusaderky opened on Mar 8, 2026

Poorly managed shutdown of distributed and/or sqlite

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12312 In dask/dask;

· crusaderky opened on Mar 4, 2026

Request for improved error handling when using nout in delayed functions

needs triageNeeds a response from a contributorNeeds a response from a contributor

Status: Open.

#12295 In dask/dask;

· tmillenaar opened on Feb 18, 2026

Flaky test_collection.py::test_len

testsUnit tests and/or continuous integrationUnit tests and/or continuous integration

Status: Open.

#12275 In dask/dask;

· crusaderky opened on Feb 4, 2026