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Severe repartition slowdown for wide PyArrow-string DataFrames with unknown divisions

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

Status: Open.

#12449 In dask/dask;

· albarji opened on Jun 8, 2026

⚠️ Upstream CI failed ⚠️

upstream

Status: Open.

#12446 In dask/dask;

· github-actions opened on Jun 5, 2026

Pandas4Warning: The inplace keyword in DataFrame.drop is deprecated

dataframe

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

upstream

Status: Open.

#12444 In dask/dask;

· crusaderky opened on Jun 5, 2026

Document (or extend) which dask.array APIs respect array.backend for host literals

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

Status: Open.

#12440 In dask/dask;

· miguelcarcamov opened on Jun 3, 2026

Error calling dd.to_dask_array on a subset of columns from dataframe read from parquet file

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

Status: Open.

#12411 In dask/dask;

· joshua-gould opened on May 22, 2026

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

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

Performance report breaks alongside python 3.14

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

Status: Open.

#12329 In dask/dask;

· ArielDeVora opened on Mar 17, 2026

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

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.

#12318 In dask/dask;

· crusaderky opened on Mar 8, 2026

Poorly managed shutdown of distributed and/or sqlite

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.

#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