[ARROW-17736] [C++] Add fallback for shorthand Substrait URIs without scheme

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 10.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20412
• Assignee: Weston Pace
• Reporter: Weston Pace
• Created: 15/Sep/22 06:18
• Updated: 11/Jan/23 11:52
• Resolved: 26/Sep/22 20:41

Description

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.

Issue Links

• links to: GitHub Pull Request #14143