[jira] [Assigned] (ARROW-17736) [C++] Add fallback for shorthand Substrait URIs without scheme

["Vibhatha Lakmal Abeykoon (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17736?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vibhatha Lakmal Abeykoon reassigned ARROW-17736:
------------------------------------------------

    Assignee: Vibhatha Lakmal Abeykoon

> [C++] Add fallback for shorthand Substrait URIs without scheme
> --------------------------------------------------------------
>
>                 Key: ARROW-17736
>                 URL: https://issues.apache.org/jira/browse/ARROW-17736
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Weston Pace
>            Assignee: Vibhatha Lakmal Abeykoon
>            Priority: Major
>
> At the moment there is no agreed URI base for the standard Substrait functions.  The Substrait consumer is currently expecting {{https://github.com/substrait-io/substrait/blob/main/extensions/FILENAME.YAML}} but Isthmus is currently generating {{/FILENAME.YAML}}.
> Although this is a short-term problem I could imagine it popping up again from time to time when users are developing their own functions.  So, as a workaround, I suggest that any URI equal to the empty string or "/" should be treated as a "shortcut" and we fall back to name-only matching.



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