pitrou commented on code in PR #47297:
URL: https://github.com/apache/arrow/pull/47297#discussion_r2284725340


##########
cpp/src/arrow/compute/kernel.h:
##########
@@ -348,7 +348,24 @@ class ARROW_EXPORT OutputType {
   Resolver resolver_ = NULLPTR;
 };
 
-/// \brief Holds the input types and output type of the kernel.
+/// \brief Additional constraints to apply to the input types of a kernel when 
matching a
+/// specific kernel signature.
+class ARROW_EXPORT MatchConstraint {
+ public:
+  virtual ~MatchConstraint() = default;
+
+  /// \brief Return true if the input types satisfy the constraint.
+  virtual bool Matches(const std::vector<TypeHolder>& types) const = 0;

Review Comment:
   Of course we can also have an API that creates a `MatchConstraint` from a 
`std::function`, for convenience.



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