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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
1658291950 I_kwDOAMm_X85i14bu 7737 align ignores `copy` dcherian 2448579 open 0     2 2023-04-07T02:54:00Z 2023-06-20T23:07:56Z   MEMBER      

Is your feature request related to a problem?

cc @benbovy

xref #7730

``` python import numpy as np import xarray as xr

arr = np.random.randn(10, 10, 36530) time = xr.date_range("2000", periods=30365, calendar="noleap") da = xr.DataArray(arr, dims=("y", "x", "time"), coords={"time": time}) year = da["time.year"] ```

python xr.align(da, year, join="outer", copy=False) This should result in no copies, but does

Describe the solution you'd like

I think we need to check aligner.copy and/or aligner.reindex (maybe?) before copying here

https://github.com/pydata/xarray/blob/f8127fc9ad24fe8b41cce9f891ab2c98eb2c679a/xarray/core/dataset.py#L2805-L2818

Describe alternatives you've considered

No response

Additional context

No response

 
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     xarray 13221727 issue
1658287743 PR_kwDOAMm_X85N0Afw 7736 align: Avoid reindexing when join="exact" dcherian 2448579 closed 0     0 2023-04-07T02:46:08Z 2023-04-12T14:41:53Z 2023-04-12T14:41:51Z MEMBER   0 pydata/xarray/pulls/7736

xref #7730, #7737

 
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     xarray 13221727 pull
1658287592 PR_kwDOAMm_X85N0Ad4 7735 Avoid recasting a CFTimeIndex dcherian 2448579 closed 0     1 2023-04-07T02:45:55Z 2023-04-11T21:12:07Z 2023-04-11T21:12:05Z MEMBER   0 pydata/xarray/pulls/7735

xref #7730

 
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     xarray 13221727 pull
1658319105 PR_kwDOAMm_X85N0Gez 7738 [skip-ci] Add alignment benchmarks dcherian 2448579 closed 0     0 2023-04-07T03:40:32Z 2023-04-07T22:31:08Z 2023-04-07T22:31:05Z MEMBER   0 pydata/xarray/pulls/7738

xref #4648

 
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     xarray 13221727 pull

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