[ARROW-17989] [C++] Enable struct_field kernel to accept string field names

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 11.0.0
• Component/s: C++
• Labels: compute pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/33194
• Assignee: Miles Granger
• Reporter: Joris Van den Bossche
• Created: 11/Oct/22 13:36
• Updated: 11/Jan/23 11:57
• Resolved: 22/Nov/22 10:57

Description

Currently the "struct_field" kernel only works for integer indices for the child fields. From the StructFieldOption class (https://github.com/apache/arrow/blob/3d7f2f22a0fc441a41b8fa971e11c0f4290ebb24/cpp/src/arrow/compute/api_scalar.h#L283-L285):

  /// The child indices to extract. For instance, to get the 2nd child
  /// of the 1st child of a struct or union, this would be {0, 1}.
  std::vector<int> indices;

It would be nice if you could also refer to fields by name in addition to by position.

Issue Links

• is related to: ARROW-18295 [C++] FieldRef::FindAll/FindOne(DataType) improve error
• is related to: ARROW-17141 [C++] Enable selecting nested fields in StructArray with field path
• links to: GitHub Pull Request #14495