pitrou commented on code in PR #46715:
URL: https://github.com/apache/arrow/pull/46715#discussion_r2128238914


##########
cpp/src/arrow/compute/expression.cc:
##########
@@ -260,7 +260,9 @@ bool Expression::Equals(const Expression& other) const {
   return false;
 }
 
-bool Identical(const Expression& l, const Expression& r) { return l.impl_ == 
r.impl_; }
+ARROW_EXPORT bool Identical(const Expression& l, const Expression& r) {

Review Comment:
   This could easily be a static method on `Expression` instead of a friend 
function. 



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