issues: 816540158

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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
816540158 MDU6SXNzdWU4MTY1NDAxNTg= 4958 to_zarr mode='a-', append_dim; if dim value exists raise error 15331990 open 0     1 2021-02-25T15:26:02Z 2022-04-09T15:19:28Z   CONTRIBUTOR      

If I have a ds with time, lat, lon and I call the same command twice: python ds.to_zarr('test.zarr', append_dim='time') ds.to_zarr('test.zarr', append_dim='time') Can it raise an error since all the times already exist?

Kind of like: ```python import numpy as np import xarray as xr

ds = xr.tutorial.open_dataset('air_temperature') ds.to_zarr('test_air.zarr', append_dim='time') ds_tmp = xr.open_mfdataset('test_air.zarr', engine='zarr') overlap = np.intersect1d(ds['time'], ds_tmp['time']) if len(overlap) > 1: raise ValueError(f'Found overlapping values in datasets {overlap}') ds.to_zarr('test_air.zarr', append_dim='time') ```

 
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