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
449004641,MDU6SXNzdWU0NDkwMDQ2NDE=,2993,`xr.open_dataset` with `pydapdatastore` raises `too many indices for array` error,8037983,closed,0,,,5,2019-05-27T22:35:36Z,2023-12-02T02:48:09Z,2023-12-02T02:48:09Z,NONE,,,,"Hi, 
I'm trying to use xarray.open_dataset() to open password-protected Opendap files. I was able to create a valid `pydap.cas session`and `xr.backends.PydapDataStore` object. However, when I pass them to `xr.open_dataset()` method, I get the `IndexError: too many indices for array
` error.  My dataset has a single time point.  I'm wondering if this may be related to this previous issue(#476).  Could you help me sort out this issue?  Thank you!

```python
# OpenDAP authroization
from netrc import netrc
username, _, pw = netrc().hosts['urs.earthdata.nasa.gov']

#OPENDAP client
from pydap.client import open_url
from pydap.cas.urs import setup_session

url = ('https://hydro1.gesdisc.eosdis.nasa.gov/opendap/hyrax/FLDAS/'
       'FLDAS_NOAH01_A_EA_D.001/2019/04/FLDAS_NOAH01_A_EA_D.A20190401.001.nc')

session = setup_session(username, pw, check_url=url)
store = xr.backends.PydapDataStore.open(url, session=session)
ds = xr.open_dataset(store)
```
#### Problem description
![image](https://user-images.githubusercontent.com/8037983/58441113-13f74c80-8094-11e9-9166-626ed4bc8e08.png)


---
### Update: 
On the other hand, I was able to read in the data using the `store.get_variable()` method directly, but no coordinate metadata are read.
![image](https://user-images.githubusercontent.com/8037983/58441479-566e5880-8097-11e9-802c-b2efa221f533.png)

Also, 
the `store` object's `dimension` attribute doesn't seem to exist:
![image](https://user-images.githubusercontent.com/8037983/58441837-3ee49f00-809a-11e9-9875-cc9751760e1e.png)


<details>
INSTALLED VERSIONS
------------------
commit: None
python: 3.7.1 | packaged by conda-forge | (default, Feb 18 2019, 01:42:00) 
[GCC 7.3.0]
python-bits: 64
OS: Linux
OS-release: 3.10.0-862.11.6.el7.x86_64
machine: x86_64
processor: x86_64
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8
libhdf5: 1.10.4
libnetcdf: 4.6.2

xarray: 0.12.1
pandas: 0.24.2
numpy: 1.16.3
scipy: 1.3.0
netCDF4: 1.5.1.2
pydap: installed
h5netcdf: None
h5py: 2.9.0
Nio: None
zarr: 2.3.1
cftime: 1.0.3.4
nc_time_axis: None
PseudonetCDF: None
rasterio: 1.0.22
cfgrib: None
iris: None
bottleneck: None
dask: 1.2.2
distributed: 1.28.1
matplotlib: 3.1.0
cartopy: 0.17.0
seaborn: None
setuptools: 41.0.1
pip: 19.1
conda: None
pytest: 4.5.0
IPython: 7.1.1
sphinx: None

</details>
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/2993/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,not_planned,13221727,issue