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

["Weston Pace (Jira)" <ji...@apache.org>]

Weston Pace created ARROW-17736:
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             Summary: [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


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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