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/292#issuecomment-849308907,https://api.github.com/repos/simonw/datasette/issues/292,849308907,MDEyOklzc3VlQ29tbWVudDg0OTMwODkwNw==,9599,simonw,2021-05-27T04:25:01Z,2021-05-27T04:25:01Z,OWNER,Now that `?_col=` and `?_nocol=` are implemented I'm closing this ticket - other customizations can already be handled by defining SQL views or creating canned SQL queries.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-549584753,https://api.github.com/repos/simonw/datasette/issues/292,549584753,MDEyOklzc3VlQ29tbWVudDU0OTU4NDc1Mw==,9599,simonw,2019-11-04T22:54:26Z,2019-11-04T22:54:26Z,OWNER,I'm going to split off an issue just for `?_col=` and `?_nocol=`,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-549169101,https://api.github.com/repos/simonw/datasette/issues/292,549169101,MDEyOklzc3VlQ29tbWVudDU0OTE2OTEwMQ==,9599,simonw,2019-11-03T19:17:08Z,2019-11-03T19:17:16Z,OWNER,"A good basic starting point for this would be to ignore the ability to add custom SQL fragments and instead focus on being able to show and hide specific columns. This will play particularly well with #613.
Proposed syntax for that:
`/db/table?_col=id&_col=name` - just show the `id` and `name` columns
`/db/table?_nocol=extras&_nocol=age` - show all columns except for `extras` and `age`
I don't think it makes sense to allow both `?_col=` and `?_nocol=` arguments in the same request, so if you provide both I think we throw a 400 error.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-423543060,https://api.github.com/repos/simonw/datasette/issues/292,423543060,MDEyOklzc3VlQ29tbWVudDQyMzU0MzA2MA==,9599,simonw,2018-09-21T14:06:31Z,2018-09-21T14:09:06Z,OWNER,"I keep on finding new reasons that I want this.
The latest is that I'm playing with the more advanced features of FTS5 - in particular the highlight() function and the ability to sort by rank.
The problem is... in order to do this, I need to properly join against the `_fts` table. Here's an example query:
select
highlight(events_fts, 0, '', ''),
events_fts.rank,
events.*
from events
join events_fts on events.rowid = events_fts.rowid
where events_fts match :search
order by rank
Note that this is a different query from the usual FTS one (which does `where rowid in (select rowid from events_fts...)`) because I need the rank column somewhere I can sort against.
I'd like to be able to use this on the table view page so I can get faceting etc for free, but this is a completely different query from the default. Maybe I need a way to customize the entire query? That feels weird though - why am I not using a view in that case?
Answer: because views can't accept `:search` style parameters. I could use a canned query, but canned queries don't get faceting etc.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392343839,https://api.github.com/repos/simonw/datasette/issues/292,392343839,MDEyOklzc3VlQ29tbWVudDM5MjM0MzgzOQ==,9599,simonw,2018-05-27T16:10:09Z,2018-06-04T17:38:04Z,OWNER,"The more efficient way of doing this kind of count would be to provide a mechanism which can also add extra fragments to a `GROUP BY` clause used for the `SELECT`.
Or... how about a mechanism similar to Django's `prefetch_related` which lets you define extra queries that will be called with a list of primary keys (or values from other columns) and used to populate a new column? A little unconventional but could be extremely useful and efficient.
Related to that: since the per-query overhead in SQLite is tiny, could even define an extra query to be run once-per-row before returning results.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392350980,https://api.github.com/repos/simonw/datasette/issues/292,392350980,MDEyOklzc3VlQ29tbWVudDM5MjM1MDk4MA==,9599,simonw,2018-05-27T17:56:30Z,2018-05-27T17:56:50Z,OWNER,"Should `?_raw=1` also turn off foreign key expansions? No, we will eventually provide a separate mechanism for that (or leave it to nerds who care to figure out using JSON or CSV export).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392350568,https://api.github.com/repos/simonw/datasette/issues/292,392350568,MDEyOklzc3VlQ29tbWVudDM5MjM1MDU2OA==,9599,simonw,2018-05-27T17:48:45Z,2018-05-27T17:54:41Z,OWNER,"If any `?_column=` parameters are provided the metadata version is completely ignored.
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392350495,https://api.github.com/repos/simonw/datasette/issues/292,392350495,MDEyOklzc3VlQ29tbWVudDM5MjM1MDQ5NQ==,9599,simonw,2018-05-27T17:47:31Z,2018-05-27T17:47:31Z,OWNER,"Querystring design:
* `?_column=a&_column=b` - equivalent of `""columns"": [""a"", ""b""]` in `metadata.json`
* `?_select_nameupper=upper(name)` - equivalent of `""column_selects"": {""nameupper"": ""upper(name)""}`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392345062,https://api.github.com/repos/simonw/datasette/issues/292,392345062,MDEyOklzc3VlQ29tbWVudDM5MjM0NTA2Mg==,9599,simonw,2018-05-27T16:26:53Z,2018-05-27T16:26:53Z,OWNER,There needs to be a way to turn this off and return to Datasette default bahviour. Maybe a `?_raw=1` querystring parameter for the table view.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392343690,https://api.github.com/repos/simonw/datasette/issues/292,392343690,MDEyOklzc3VlQ29tbWVudDM5MjM0MzY5MA==,9599,simonw,2018-05-27T16:08:25Z,2018-05-27T16:08:40Z,OWNER,"Turns out it's actually possible to pull data from other tables using the mechanism in the prototype:
```
{
""databases"": {
""wtr"": {
""tables"": {
""license"": {
""column_selects"": {
""count"": ""(select count(*) from license_frequency where license_frequency.license = license.id)""
}
}
}
}
}
}
```
Performance using this technique is pretty terrible though:
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392342947,https://api.github.com/repos/simonw/datasette/issues/292,392342947,MDEyOklzc3VlQ29tbWVudDM5MjM0Mjk0Nw==,9599,simonw,2018-05-27T16:01:43Z,2018-05-27T16:01:43Z,OWNER,I'd still like to be able to over-ride this using querystring arguments.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392342269,https://api.github.com/repos/simonw/datasette/issues/292,392342269,MDEyOklzc3VlQ29tbWVudDM5MjM0MjI2OQ==,9599,simonw,2018-05-27T15:55:40Z,2018-05-27T16:01:26Z,OWNER,"Here's the metadata I tried against that first working prototype:
```
{
""databases"": {
""timezones"": {
""tables"": {
""timezones"": {
""columns"": [""PK_UID""],
""column_selects"": {
""upper_tzid"": ""upper(tzid)"",
""Geometry"": ""AsGeoJSON(Geometry)""
}
}
}
},
""wtr"": {
""tables"": {
""license_frequency"": {
""columns"": [""id"", ""license"", ""tx_rx"", ""frequency""],
""column_selects"": {
""latitude"": ""Y(Geometry)"",
""longitude"": ""X(Geometry)""
}
}
}
}
}
}
```
Run using this:
datasette timezones.db wtr.db \
--reload --debug --load-extension=/usr/local/lib/mod_spatialite.dylib \
-m column-metadata.json --config sql_time_limit_ms:10000
Usefully, the `--reload` flag detects changes to the `metadata.json` file as well as Datasette's own Python code.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392338130,https://api.github.com/repos/simonw/datasette/issues/292,392338130,MDEyOklzc3VlQ29tbWVudDM5MjMzODEzMA==,9599,simonw,2018-05-27T15:09:18Z,2018-05-27T15:09:28Z,OWNER,"Here's my first sketch at a metadata format for this:
* `columns`: optional list of columns to include - if missing, shows all
* `column_selects`: dictionary mapping column names to alternative select clauses
`column_selects` can also invent new keys and use them to create derived columns. These new keys will be selected at the end of the list of columns UNLESS they are mentioned in `columns`, in which case that sequence will define the order.
Can you facet by things that are customized using `column_selects`? Yes, and let's try running suggested facets against those columns as well.
```
{
""databases"": {
""databasename"": {
""tables"": {
""tablename"": {
""columns"": [
""id"", ""name"", ""size""
],
""column_selects"": {
""name"": ""upper(name)"",
""geo_json"": ""AsGeoJSON(Geometry)""
}
""row_columns"": [...]
""row_column_selects"": {...}
}
```
The `row_columns` and `row_column_selects` properties work the same as the `column*` ones, except they are applied on the row page instead.
If omitted, the `column*` ones will be used on the row page as well.
If you want the row page to switch back to Datasette's default behaviour you can set `""row_columns"": [], ""row_column_selects"": {}`.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392316701,https://api.github.com/repos/simonw/datasette/issues/292,392316701,MDEyOklzc3VlQ29tbWVudDM5MjMxNjcwMQ==,9599,simonw,2018-05-27T09:08:49Z,2018-05-27T09:08:49Z,OWNER,I could certainly see people wanting different custom column selects for the row page compared to the table page.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,
https://github.com/simonw/datasette/issues/292#issuecomment-392316673,https://api.github.com/repos/simonw/datasette/issues/292,392316673,MDEyOklzc3VlQ29tbWVudDM5MjMxNjY3Mw==,9599,simonw,2018-05-27T09:08:06Z,2018-05-27T09:08:06Z,OWNER,Open question: how should this affect the row page? Just because columns were hidden on the table page doesn't necessarily mean they should be hidden on the row page as well. ,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",326800219,Mechanism for customizing the SQL used to select specific columns in the table view,