benibus commented on code in PR #37418:
URL: https://github.com/apache/arrow/pull/37418#discussion_r1316108410


##########
cpp/src/arrow/compute/registry.cc:
##########
@@ -276,6 +276,7 @@ static std::unique_ptr<FunctionRegistry> 
CreateBuiltInRegistry() {
   // Register core kernels
   RegisterScalarCast(registry.get());
   RegisterDictionaryDecode(registry.get());
+  RegisterDictionaryCompaction(registry.get());

Review Comment:
   Do we actually want to register these here or should that be done in the 
`#if ARROW_COMPUTE` block below? Generally speaking, the "core" kernel library 
is limited to casts and their dependencies - although there are a few 
exceptions.
   
   Granted, I'm pretty sure doing that would also necessitate moving the tests 
out of `vector_hash_test.cc` since it's built/run unconditionally.



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