html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/3746#issuecomment-581972445,https://api.github.com/repos/pydata/xarray/issues/3746,581972445,MDEyOklzc3VlQ29tbWVudDU4MTk3MjQ0NQ==,2448579,2020-02-04T15:45:55Z,2020-02-04T15:45:55Z,MEMBER,IMO we should fix to remove associated indexes and issue a patch release.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,559645981
https://github.com/pydata/xarray/issues/3746#issuecomment-581940682,https://api.github.com/repos/pydata/xarray/issues/3746,581940682,MDEyOklzc3VlQ29tbWVudDU4MTk0MDY4Mg==,167802,2020-02-04T14:40:09Z,2020-02-04T14:40:09Z,CONTRIBUTOR,"Thanks for the clarification. I can confirm that `drop_vars` works as expected. As a user, I would vote for having `__delitem__` call `drop_vars`, at least for now to keep backwards compatibility ?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,559645981
https://github.com/pydata/xarray/issues/3746#issuecomment-581914938,https://api.github.com/repos/pydata/xarray/issues/3746,581914938,MDEyOklzc3VlQ29tbWVudDU4MTkxNDkzOA==,14808389,2020-02-04T13:42:41Z,2020-02-04T14:31:23Z,MEMBER,"the issue here is that if you call `__delitem__` on `DataArray.coords` (which returns a dict-like object named `DataArrayCoordinates`), it deletes the coordinates, but leaves the indexes intact:
```python
In [13]: arr1_ = arr1.copy()
    ...: del arr1_.coords[""x""]
    ...: del arr1_.coords[""y""]
    ...: arr1_.coords, arr1_.indexes
Out[13]:
(Coordinates:
     *empty*, y: Int64Index([0, 1], dtype='int64', name='y')
 x: Int64Index([0, 1], dtype='int64', name='x'))
```

Since #3481 the indexes are passed along in binary operations (such as multiplication) and will thus cause the coordinates reappear. Note that coordinates without indexes (non-dimension coordinates) will be removed properly.

If we want to support this way of dropping coordinates we should update the indexes, explicitly or via `drop_vars`, otherwise we might want to make `*Coordinates` objects read-only.

For now the easiest way to properly remove coordinates is by using `drop_vars`.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,559645981
https://github.com/pydata/xarray/issues/3746#issuecomment-581936376,https://api.github.com/repos/pydata/xarray/issues/3746,581936376,MDEyOklzc3VlQ29tbWVudDU4MTkzNjM3Ng==,14808389,2020-02-04T14:30:41Z,2020-02-04T14:30:41Z,MEMBER,"I don't know whether or not this was supposed to work. Since there is a explicit `__delitem__`, I'd say it was at some point and my question above is more along the lines of ""should this still work?"".","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,559645981
https://github.com/pydata/xarray/issues/3746#issuecomment-581925761,https://api.github.com/repos/pydata/xarray/issues/3746,581925761,MDEyOklzc3VlQ29tbWVudDU4MTkyNTc2MQ==,167802,2020-02-04T14:08:03Z,2020-02-04T14:08:03Z,CONTRIBUTOR,"@keewis thanks for the quick reply. I wasn't aware the builtin `del` wasn't supposed to work here, I'll try with `drop_vars` instead.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,559645981