id,node_id,number,state,locked,title,user,body,created_at,updated_at,closed_at,merged_at,merge_commit_sha,assignee,milestone,draft,head,base,author_association,auto_merge,repo,url,merged_by
83548075,MDExOlB1bGxSZXF1ZXN0ODM1NDgwNzU=,996,closed,0,add 'no_conflicts' as compat option for merging non-conflicting data,8982598,"This solves #742 and partially #835 (does not address a combine_first option yet). It essentially adds a notnull_equals method to Variable (and currently DataArray/set) that merge can use to compare objects, subsequently combining them with 'fillna'. Used as such:

``` python
>>> import xarray as xr
>>> ds1 = xr.Dataset(data_vars={'x': ('a', [1, 2])})
>>> ds2 = xr.Dataset(data_vars={'x': ('a', [2, 3])}, coords={'a': [1, 2]})
>>> xr.merge([ds1, ds2], compat='notnull_equals')
<xarray.Dataset>
Dimensions:  (a: 3)
Coordinates:
  * a        (a) int64 0 1 2
Data variables:
    x        (a) float64 1.0 2.0 3.0
```

Should be very easy to add other merging options such as overwriting left to write and vice versa. 
## TODO
- docs
- tests for various type combinations
- some of the error excepting is mirrored from `equals` and might not be necessary (e.g. for numpy structured arrays).
## ISSUES
- It seemed natural to add notnull_equals as a method to Dataset, but it might be unnecessary/not useful. Current version is conservative in that it still requires aligned Datasets with all the same variables.
- Due to the float nature of NaN, type is sometimes not preserved, e.g. merging two int arrays yields a float array, even when the final array has no NaN values itself.
- float rounding errors can cause unintended failures, so a notnull_allclose option might be nice.

Currently all tests passing (6 new), and no flake8 errors on the diff...
",2016-08-31T23:38:00Z,2016-09-15T16:07:16Z,2016-09-15T16:07:16Z,2016-09-15T16:07:16Z,f40d323c76f6cab9615567e4ba7afde7860f7775,,,0,0e814386aebbeb40c8c9c5eff79b5f31904997ba,41654ef5e9da8cd15f3b68f8384f8c45c7fc16e9,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/996,
190798560,MDExOlB1bGxSZXF1ZXN0MTkwNzk4NTYw,2189,closed,0,docs: add xyzpy to projects,8982598,Justs adds [xyzpy](http://xyzpy.readthedocs.io) to the list of projects utilizing ``xarray``.,2018-05-27T17:38:44Z,2018-05-27T20:46:07Z,2018-05-27T20:45:38Z,2018-05-27T20:45:38Z,a8c1ed2ae3cc15863d37d869a7e1658eb33e01f6,,,0,45c9dc0a4fd49f56312540b247a592ce1ddee9da,a28aab005b42eabe0b1651d2330ed2f3268bb9f8,CONTRIBUTOR,,13221727,https://github.com/pydata/xarray/pull/2189,