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Major performance regression in Coordinates.to_index()

bug

needs triageIssue that has not been reviewed by xarray team memberIssue that has not been reviewed by xarray team member

Status: Open.

#11305 In pydata/xarray;

· y4n9squared opened on Apr 17, 2026

_decode_cf_datetime_dtype triggers 2 store reads per time variable — expensive on remote stores

Status: Open.

#11303 In pydata/xarray;

· aladinor opened on Apr 17, 2026

.idxmax() fails if coordinates are intervals

bug

needs triageIssue that has not been reviewed by xarray team memberIssue that has not been reviewed by xarray team member

Status: Open.

#11300 In pydata/xarray;

· j-haacker opened on Apr 16, 2026

Negative chunks break in newer version

bug

topic-zarrRelated to zarr storage libraryRelated to zarr storage library

Status: Open.

#11288 In pydata/xarray;

· hhalaby opened on Apr 9, 2026

Codec-based alternative to attribute-based scale-offset encoding

needs triageIssue that has not been reviewed by xarray team memberIssue that has not been reviewed by xarray team member

Status: Open.

#11280 In pydata/xarray;

· d-v-b opened on Apr 2, 2026

Units and calendar attributes of time_bnds are dropped by to_netcdf

plan to closeMay be closeable, needs more eyeballsMay be closeable, needs more eyeballs

topic-CF conventions

Status: Open.

#11275 In pydata/xarray;

· briardew opened on Apr 1, 2026

Add CI to ensure all requires_ tests are run at least once

CIContinuous Integration toolsContinuous Integration tools

enhancement

topic-testing

Status: Open.

#11273 In pydata/xarray;

· VeckoTheGecko opened on Mar 31, 2026

No way to specify compat behaviour for xr.apply_ufunc and ops that use it; binary arithmetic ufuncs don't use arithmetic_compat.

enhancement

Status: Open.

#11272 In pydata/xarray;

· mjwillson opened on Mar 30, 2026

⚠️ Nightly upstream-dev CI failed ⚠️

CIContinuous Integration toolsContinuous Integration tools

Status: Open.

#11268 In pydata/xarray;

· github-actions opened on Mar 29, 2026

Inconsistent and unexpected results when grouping by more than one coordinate

bug

needs triageIssue that has not been reviewed by xarray team memberIssue that has not been reviewed by xarray team member

Status: Open.

#11264 In pydata/xarray;

· joshua-gould opened on Mar 26, 2026

Incorrect 'cumsum' results when chunking before loading.

bug

needs triageIssue that has not been reviewed by xarray team memberIssue that has not been reviewed by xarray team member

Status: Open.

#11262 In pydata/xarray;

· muttener opened on Mar 25, 2026

Use zarr.Array.async_array

topic-zarrRelated to zarr storage libraryRelated to zarr storage library

Status: Open.

#11259 In pydata/xarray;

· ilan-gold opened on Mar 25, 2026