html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/datasette/issues/1101#issuecomment-1105642187,https://api.github.com/repos/simonw/datasette/issues/1101,1105642187,IC_kwDOBm6k_c5B5sLL,25778,2022-04-21T18:59:08Z,2022-04-21T18:59:08Z,CONTRIBUTOR,"Ha! That was your idea (and a good one).

But it's probably worth measuring to see what overhead it adds. It did require both passing in the database and making the whole thing `async`. 

Just timing the queries themselves:

1. [Using `AsGeoJSON(geometry) as geometry`](https://alltheplaces-datasette.fly.dev/alltheplaces?sql=select%0D%0A++id%2C%0D%0A++properties%2C%0D%0A++AsGeoJSON%28geometry%29+as+geometry%2C%0D%0A++spider%0D%0Afrom%0D%0A++places%0D%0Aorder+by%0D%0A++id%0D%0Alimit%0D%0A++1000) takes 10.235 ms
2. [Leaving as binary](https://alltheplaces-datasette.fly.dev/alltheplaces?sql=select%0D%0A++id%2C%0D%0A++properties%2C%0D%0A++geometry%2C%0D%0A++spider%0D%0Afrom%0D%0A++places%0D%0Aorder+by%0D%0A++id%0D%0Alimit%0D%0A++1000) takes 8.63 ms

Looking at the network panel:

1. Takes about 200 ms for the `fetch` request
2. Takes about 300 ms

I'm not sure how best to time the GeoJSON generation, but it would be interesting to check. Maybe I'll write a plugin to add query times to response headers.

The other thing to consider with async streaming is that it might be well-suited for a slower response. When I have to get the whole result and send a response in a fixed amount of time, I need the most efficient query possible. If I can hang onto a connection and get things one chunk at a time, maybe it's ok if there's some overhead.
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",749283032,
https://github.com/simonw/datasette/issues/1101#issuecomment-1105588651,https://api.github.com/repos/simonw/datasette/issues/1101,1105588651,IC_kwDOBm6k_c5B5fGr,25778,2022-04-21T18:15:39Z,2022-04-21T18:15:39Z,CONTRIBUTOR,"What if you split rendering and streaming into two things:

- `render` is a function that returns a response
- `stream` is a function that sends chunks, or yields chunks passed to an ASGI `send` callback

That way current plugins still work, and streaming is purely additive. A `stream` function could get a cursor or iterator of rows, instead of a list, so it could more efficiently handle large queries.
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