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/3791#issuecomment-604537050,https://api.github.com/repos/pydata/xarray/issues/3791,604537050,MDEyOklzc3VlQ29tbWVudDYwNDUzNzA1MA==,14808389,2020-03-26T16:39:38Z,2020-03-26T16:39:38Z,MEMBER,"The only way I could come up with is:
```python
In [2]: a = xr.DataArray( 
   ...:     name=""sample_id"", 
   ...:     data=[1, 2, 3], 
   ...:     dims=""population_name"", 
   ...:     coords={""population_name"": [""AFR"", ""EUR"", ""EUR""]}, 
   ...: ) 
   ...: b = xr.DataArray( 
   ...:     name=""population_size"", 
   ...:     data=[10, 100], 
   ...:     dims=""population_name"", 
   ...:     coords={""population_name"": [""AFR"", ""EUR""]}, 
   ...: ) 
   ...: a.to_dataset().assign({b.name: b.sel(population_name=a.population_name)})
Out[2]: 
<xarray.Dataset>
Dimensions:          (population_name: 3)
Coordinates:
  * population_name  (population_name) <U3 'AFR' 'EUR' 'EUR'
Data variables:
    sample_id        (population_name) int64 1 2 3
    population_size  (population_name) int64 10 100 100
```
which is a manual join?","{""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,569176457
https://github.com/pydata/xarray/issues/3791#issuecomment-598800439,https://api.github.com/repos/pydata/xarray/issues/3791,598800439,MDEyOklzc3VlQ29tbWVudDU5ODgwMDQzOQ==,306380,2020-03-13T16:12:53Z,2020-03-13T16:12:53Z,MEMBER,"I wonder if there are multi-dimensional analogs that might be interesting.

@eric-czech , if you have time to say a bit more about the data and operation that you're trying to do I think it would be an interesting exercise to see how to do that operation with Xarray's current functionality.  I wouldn't be surprised to learn that there was some way to do what you wanted that went under a different name here.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,569176457
https://github.com/pydata/xarray/issues/3791#issuecomment-595406486,https://api.github.com/repos/pydata/xarray/issues/3791,595406486,MDEyOklzc3VlQ29tbWVudDU5NTQwNjQ4Ng==,5635139,2020-03-05T19:32:38Z,2020-03-05T19:32:38Z,MEMBER,"Hi @eric-czech -- thanks for the issue. 

Unfortunately xarray isn't strong as these sort of relational joins, and I don't think there's a way of doing that specific operation. Relational algebra generally depends on data on a single dimension, which fits into xarray's model less well.

Feel free to post back here with contiguous questions, though","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,569176457