wesm commented on code in PR #13364:
URL: https://github.com/apache/arrow/pull/13364#discussion_r897353943


##########
cpp/src/arrow/compute/exec.h:
##########
@@ -252,6 +254,192 @@ struct ARROW_EXPORT ExecBatch {
 inline bool operator==(const ExecBatch& l, const ExecBatch& r) { return 
l.Equals(r); }
 inline bool operator!=(const ExecBatch& l, const ExecBatch& r) { return 
!l.Equals(r); }
 
+struct ExecValue {
+  enum Kind { ARRAY, SCALAR };
+  Kind kind = ARRAY;
+  ArraySpan array;

Review Comment:
   I though it made sense for const-ness to be dealt with at the ExecValue 
level -- if you have `const ExecValue& value` then `value.array` is const



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