id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
944903881,MDU6SXNzdWU5NDQ5MDM4ODE=,1396,"""invalid reference format"" publishing Docker image",9599,closed,0,,,9,2021-07-15T01:02:07Z,2021-10-19T08:10:26Z,2021-07-15T19:47:25Z,OWNER,,"Error ocurred at the end of the publish flow for Datasette 0.58: https://github.com/simonw/datasette/runs/3072216421
```
Removing intermediate container cf32b9440907
 ---> dfd6985b2afc
Successfully built dfd6985b2afc
Successfully tagged ***/datasette:0.58
invalid reference format
Error: Process completed with exit code 1.
```",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1396/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed
944870799,MDU6SXNzdWU5NDQ4NzA3OTk=,1394,Big performance boost on faceting: skip the inner order by,9599,closed,0,,,4,2021-07-14T23:32:29Z,2021-07-16T02:23:32Z,2021-07-15T00:05:50Z,OWNER,,"I just noticed something that could make for a huge performance improvement in faceting.

The default query used by Datasette when faceting looks like this:
```sql
select
  country_long,
  count(*)
from (
  select * from [global-power-plants] order by rowid
)
where
  country_long is not null
group by
  country_long
order by
  count(*) desc
```
Here it takes 53ms: https://global-power-plants.datasettes.com/global-power-plants?sql=select%0D%0A++country_long%2C%0D%0A++count%28*%29%0D%0Afrom+%28%0D%0A++select+*+from+%5Bglobal-power-plants%5D+order+by+rowid%0D%0A%29%0D%0Awhere%0D%0A++country_long+is+not+null%0D%0Agroup+by%0D%0A++country_long%0D%0Aorder+by%0D%0A++count%28*%29+desc

Note that there's a `order by rowid` in there which isn't necessary - the order on that inner query doesn't matter since we're grouping and counting.

I had assumed SQLite would optimize this away - but it turns out it doesn't! Consider this version of the query, with that pointless order by removed:
```
select
  country_long,
  count(*)
from (
  select * from [global-power-plants]
)
where
  country_long is not null
group by
  country_long
order by
  count(*) desc
```
https://global-power-plants.datasettes.com/global-power-plants?sql=select%0D%0A++country_long%2C%0D%0A++count%28*%29%0D%0Afrom+%28%0D%0A++select+*+from+%5Bglobal-power-plants%5D%0D%0A%29%0D%0Awhere%0D%0A++country_long+is+not+null%0D%0Agroup+by%0D%0A++country_long%0D%0Aorder+by%0D%0A++count%28*%29+desc runs in 7.2ms!

I tried this optimization on a table with 2.5m rows in it - without the optimization it took 5 seconds, with the optimization it took 450ms. So this is a very significant improvement!",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1394/reactions"", ""total_count"": 2, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 1, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed