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
225222227,MDExOlB1bGxSZXF1ZXN0MTE4MjU1ODUw,1389,Sortby,5572303,closed,0,,,28,2017-04-29T00:44:01Z,2017-05-12T18:36:30Z,2017-05-12T00:29:12Z,CONTRIBUTOR,,0,pydata/xarray/pulls/1389," - [x] closes #967
 - [x] tests added / passed
 - [x] passes ``git diff upstream/master | flake8 --diff``
 - [x] whatsnew entry
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200478981,MDExOlB1bGxSZXF1ZXN0MTAxMzM5ODIw,1204,combine_first by using apply_ufunc in ops.fillna,5572303,closed,0,,,9,2017-01-12T21:03:53Z,2017-01-23T22:43:32Z,2017-01-23T22:39:57Z,CONTRIBUTOR,,0,pydata/xarray/pulls/1204,"Implementing `ops.fillna` using `apply_ufunc`, with a `join` kwarg.  The new `ops.fillna` is then used to implement `combine_first` in both DataArray and Dataset objects.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/1204/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
185794232,MDExOlB1bGxSZXF1ZXN0OTEyOTA5MzM=,1065,Options to binary ops kwargs,5572303,closed,0,,,11,2016-10-27T22:17:16Z,2016-11-12T04:00:10Z,2016-11-12T03:59:42Z,CONTRIBUTOR,,0,pydata/xarray/pulls/1065,"Currently the default is join=""inner"". However, there can be applications where the majority of binary operations require join=""outer"", not ""inner"".

Addresses https://github.com/pydata/xarray/issues/1059

The solution we come up with is adding a default key/value to OPTIONS, and dynamically access/update it in code (_binary_op in both dataarray.py and dataset.py)

We've also added test modules in test_dataarray.py and test_dataset.py.  All tests passed.
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