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
536214141,MDExOlB1bGxSZXF1ZXN0MzUxNzg0Nzk5,3610,Fix zarr append with groups,5802846,closed,0,,,12,2019-12-11T08:24:44Z,2020-03-02T12:19:17Z,2020-03-02T12:19:17Z,CONTRIBUTOR,,0,pydata/xarray/pulls/3610,"Fixes the issue that `xarray.core.dataset.Dataset.to_zarr` produced errors when using `append_dim` and `group` simultaneously. The issue was that during appending, the zarr store was opened without the group information.

 - [x] Closes #3170
 - [x] Tests added
 - [x] Passes `black . && mypy . && flake8`
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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