kou commented on PR #15014:
URL: https://github.com/apache/arrow/pull/15014#issuecomment-1358658194

   > is `_` the placeholder here?
   
   `_` isn't a placeholder. The real crossbow command what I used is 
`@github-actions crossbow submit conda-linux-*-cpu-r* -g r`. `*` is a glob 
pattern. If the command is processed as a Markdown text, `*...*` is replaced 
with `<em>...</em>`. This is the trick. :-)
   
   >  And what's the difference between before `-g` and after?
   
   Without `-g`: Find tasks from `tasks:` in `dev/tasks/tasks.yml`
   
   With `-g`: Find groups from `groups:` in dev/tasks/tasks.yml`. Found groups 
are expanded to tasks.
    
   > Extrapolating from `crossbow submit -g conda`, I would have naïvely 
expected to be able to run all conda-r builds as
   > 
   > > `crossbow submit - g conda-*-r`
   
   We can use `@github-actions crossbow submit conda-*-r` for them.


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