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/2298#issuecomment-406128252,https://api.github.com/repos/pydata/xarray/issues/2298,406128252,MDEyOklzc3VlQ29tbWVudDQwNjEyODI1Mg==,6815844,2018-07-19T01:47:36Z,2018-07-19T01:47:36Z,MEMBER,"Thanks, @shoyer 

> we have enough related functionality (e.g., for lazy and explicit indexing) 

Agreed.
Actually, it sounds very fun to code the lazy arithmetics.

> Ideally, this logic would live outside xarray. 

Yes, I concerned about this.
We have discussed to support more kinds of array-likes (e.g. dask, sparse, cupy) in #1938, 
and I thought the lazy array can be (ideally) one of them.

But in practice, it should take a long time to realize the any-array-like support and it might be a good idea to natively support the lazy mathematics for now.
If we are heading to any-array-like support, I think that the implementation of the lazy array should be as isolated from xarray core logic as possible so that we can move smoothly to the any-array-like support in the future.

Therefore, personally, I'd like to see this lazy math by implementing a lazy array.
The API I thought of is `.to_lazy()` which converts the backend to the lazy array,
as similar to that `.chunk()` converts the backend to dask array.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,342180429
https://github.com/pydata/xarray/issues/2298#issuecomment-405817290,https://api.github.com/repos/pydata/xarray/issues/2298,405817290,MDEyOklzc3VlQ29tbWVudDQwNTgxNzI5MA==,6815844,2018-07-18T05:53:18Z,2018-07-18T05:53:18Z,MEMBER,"This sounds interesting.
I am curious what the practical difference from dask is.
Does it mean some maths are lazy by default (without any external library)?","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,342180429