html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/datasette/issues/266#issuecomment-389570841,https://api.github.com/repos/simonw/datasette/issues/266,389570841,MDEyOklzc3VlQ29tbWVudDM4OTU3MDg0MQ==,9599,simonw,2018-05-16T15:54:49Z,2018-06-15T07:41:09Z,OWNER,"At the most basic level, this will work based on an extension. Most places you currently put a `.json` extension should also allow a `.csv` extension.

By default this will return the exact results you see on the current page (default max will remain 1000).

## Streaming all records

Where things get interested is *streaming mode*. This will be an option which returns ALL matching records as a streaming CSV file, even if that ends up being millions of records.

I think the best way to build this will be on top of the existing mechanism used to efficiently implement keyset pagination via `_next=` tokens.

## Expanding foreign keys

For tables with foreign key references it would be useful if the CSV format could expand those references to include the labels from `label_column` - maybe via an additional `?_expand=1` option.

When expanding each foreign key column will be shown twice:

    rowid,city_id,city_id_label,state","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",323681589,Export to CSV,