issues: 789410367

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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
789410367 MDU6SXNzdWU3ODk0MTAzNjc= 4826 Reading and writing a zarr dataset multiple times casts bools to int8 463809 closed 0     10 2021-01-19T22:02:15Z 2023-04-10T09:26:27Z 2023-04-10T09:26:27Z CONTRIBUTOR      

What happened:

Reading and writing zarr dataset multiple times into different paths changes bool dtype arrays to int8. I think this issue is related to #2937.

What you expected to happen:

My array's dtype in numpy/dask should not change, even if certain storage backends store dtypes a certain way.

Minimal Complete Verifiable Example:

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

ds = xr.Dataset({ "bool_field": xr.DataArray( np.random.randn(5) < 0.5, dims=('g'), coords={'g': np.arange(5)} ) }) ds.to_zarr('test.zarr', mode="w")

d2 = xr.open_zarr('test.zarr') print(d2.bool_field.dtype) print(d2.bool_field.encoding) d2.to_zarr("test2.zarr", mode="w")

d3 = xr.open_zarr('test2.zarr') print(d3.bool_field.dtype) `` The above snippet prints the following. In d3, the dtype ofbool_fieldisint8, presumably because d3 inherited d2'sencodingand it saysint8, despite the array having abool` dtype.

bool {'chunks': (5,), 'compressor': Blosc(cname='lz4', clevel=5, shuffle=SHUFFLE, blocksize=0), 'filters': None, 'dtype': dtype('int8')} int8 Anything else we need to know?:

Currently workaround is to explicitly set encodings. This fixes the problem:

python encoding = {k: {"dtype": d2[k].dtype} for k in d2} d2.to_zarr('test2.zarr', mode="w", encoding=encoding)

Environment:

Output of <tt>xr.show_versions()</tt> ``` # I'll update with the the full output of xr.show_versions() soon. In [4]: xr.__version__ Out[4]: '0.16.2' In [2]: zarr.__version__ Out[2]: '2.6.1' ``` 
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   completed 13221727 issue

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