edponce commented on a change in pull request #11159:
URL: https://github.com/apache/arrow/pull/11159#discussion_r712382304



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File path: cpp/src/arrow/compute/kernels/scalar_nested.cc
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@@ -80,6 +80,134 @@ const FunctionDoc list_value_length_doc{
      "Null values emit a null in the output."),
     {"lists"}};
 
+template <typename Type, typename IndexType>
+Status ListElementArray(KernelContext* ctx, const ExecBatch& batch, Datum* 
out) {
+  using ListArrayType = typename TypeTraits<Type>::ArrayType;

Review comment:
       `ListElementArray` is a function representing the `Exec` method but 
`ListElementScalar` is a struct with an actual `Exec` method. I suggest to use 
the same approach as other kernels and use a class with an `Exec` method, where 
`Exec` dispatches the corresponding processing based on input types. With this 
structure this kernel can be extended to support different combinations of 
inputs shapes (e.g., scalar-scalar, scalar-array, etc).
   
   Given that this is a scalar kernel




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