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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1318369110 I_kwDOAMm_X85OlLdW 6828 xarray.DataArray.str.cat() doesn't work on chunked data tbloch1 34276374 open 0     3 2022-07-26T14:58:16Z 2023-01-17T18:36:14Z   NONE      

What happened?

I was trying to concatenate some DataArrays of strings, and it kept just returning the first DataArray without any changes.

What did you expect to happen?

I was expecting it to just provide the strings, concatenated together with the spearator between them.

Minimal Complete Verifiable Example

```Python da = xr.DataArray( np.zeros((2, 2)).astype(str), coords={'x':np.arange(2), 'y': np.arange(2)}, dims=['x', 'y'])

dac = da.chunk()

print((da == dac).values.all()) print((da.str.cat(da, sep='--') == dac.str.cat(dac, sep='--')).values.all()) print((da.str.cat(da, sep='--') == dac.compute().str.cat(dac.compute(), sep='--')).values.all())

True False True ```

MVCE confirmation

  • [x] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [x] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [x] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [x] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

No response

Anything else we need to know?

No response

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.8.10 (default, Mar 15 2022, 12:22:08) [GCC 9.4.0] python-bits: 64 OS: Linux OS-release: 5.11.0-27-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: C.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.2 libnetcdf: 4.9.0 xarray: 2022.3.0 pandas: 1.4.2 numpy: 1.22.4 scipy: 1.8.1 netCDF4: 1.6.0 pydap: None h5netcdf: 1.0.1 h5py: 3.6.0 Nio: None zarr: 2.11.3 cftime: 1.6.1 nc_time_axis: None PseudoNetCDF: None rasterio: 1.2.10 cfgrib: None iris: None bottleneck: None dask: 2022.7.0 distributed: None matplotlib: 3.5.2 cartopy: None seaborn: None numbagg: None fsspec: 2022.5.0 cupy: None pint: None sparse: None setuptools: 62.3.2 pip: 22.1.2 conda: None pytest: None IPython: 8.3.0 sphinx: None 
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     xarray 13221727 issue

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