[ARROW-16512] [C++] Support nested custom output field names in Substrait

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• Labels: substrait
• External issue URL: https://github.com/apache/arrow/issues/31875
• Assignee: Unassigned
• Reporter: Weston Pace
• Created: 09/May/22 20:12
• Updated: 11/Jan/23 11:44

Description

ARROW-15901 added initial support RelRoot::names which assigns names to the output.

We still need to add support for struct columns. RelRoot::names should be a DFS ordered list of names that includes the names of any nested fields.