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  • shoyer · 1 ✖

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  • `to_zarr` raises `ValueError: Invalid dtype` with `mode='a'` (but not with `mode='w'`) · 1 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1065381346 https://github.com/pydata/xarray/issues/6345#issuecomment-1065381346 https://api.github.com/repos/pydata/xarray/issues/6345 IC_kwDOAMm_X84_gG3i shoyer 1217238 2022-03-11T18:38:42Z 2022-03-11T18:38:42Z MEMBER

The data type restriction here seems to date back to the original PR adding support for appending. I turned up this comment that seems to summarize the motivation for this check: https://github.com/pydata/xarray/pull/2706#issuecomment-502481584

I think the original issue was that appending a fixed-width string could be a problem if the fixed-width does not match the width of the existing string dtype stored in Zarr.

This obviously doesn't apply in this case, because you are adding an entirely new variable. So I guess the check could be removed in that case.

 
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   `to_zarr` raises `ValueError: Invalid dtype` with `mode='a'` (but not with `mode='w'`) 1164454058

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