[ARROW-8921] [C++] Add "TypeResolver" class interface to replace current OutputType::Resolver pattern

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/25052
• Assignee: Unassigned
• Reporter: Wes McKinney
• Created: 24/May/20 14:57
• Updated: 11/Jan/23 08:03

Description

Like the TypeMatcher for extensible input type checking, TypeResolver will allow more flexibility with respect to the output type resolution rule. Currently the resolver function is defined as

using Resolver =
      std::function<Result<ValueDescr>(KernelContext*, const std::vector<ValueDescr>&)>;

By changing to a TypeResolver interface with a virtual Resolve function, we also can provide for better human-readability when printing kernel signatures (by having TypeResolver::ToString) and permitting TypeResolvers to be compared

Issue Links

• is a child of: ARROW-8894 [C++] C++ array kernels framework and execution buildout (umbrella issue)