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https://issues.apache.org/jira/browse/ARROW-8921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson updated ARROW-8921:
-----------------------------------
Fix Version/s: (was: 3.0.0)
4.0.0
> [C++] Add "TypeResolver" class interface to replace current
> OutputType::Resolver pattern
> ----------------------------------------------------------------------------------------
>
> Key: ARROW-8921
> URL: https://issues.apache.org/jira/browse/ARROW-8921
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 4.0.0
>
>
> 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
> {code}
> using Resolver =
> std::function<Result<ValueDescr>(KernelContext*, const
> std::vector<ValueDescr>&)>;
> {code}
> 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
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