[ARROW-13987] [C++] Support nested FieldRefs

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: C++
• Labels: pull-request-available query-engine
• External issue URL: https://github.com/apache/arrow/issues/29587
• Assignee: David Li
• Reporter: Neal Richardson
• Created: 13/Sep/21 19:26
• Updated: 11/Jan/23 08:36
• Resolved: 08/Nov/21 14:31

Description

While it seems technically possible to construct nested FieldRefs, it doesn't seem that you can use them in practice. And it would also be nice to be able to get a nested FieldRef on an Expression. One solution could be to not handle this within FieldRefs at all and just handle it in Expressions: have a function like Expression GetField(Expression, name).

Issue Links

• blocks: ARROW-13858 [R] Create a field ref to a field in a struct
• blocks: ARROW-11259 [Python] Allow to create field reference to nested field
• is related to: ARROW-15357 [C++] Directly support nested field refs in exec plan
• is related to: ARROW-14658 [C++] Add basic support for nested field refs in scanning
• relates to: ARROW-14615 [C++] Support nested field refs into unions
• links to: GitHub Pull Request #11466