better name - not always a pointer

common/include/quantile_sketch_sorted_view.hpp

@@ -57,7 +57,7 @@ class quantile_sketch_sorted_view {
   static inline const T& deref_helper(const T* t) { return *t; }
   static inline T deref_helper(T t) { return t; }
 
-  struct compare_pairs_by_first_ptr {
+  struct compare_pairs_by_first {
     bool operator()(const Entry& a, const Entry& b) const {
       return Comparator()(deref_helper(a.first), deref_helper(b.first));
     }

common/include/quantile_sketch_sorted_view_impl.hpp

@@ -44,7 +44,7 @@ void quantile_sketch_sorted_view<T, C, A>::add(Iterator first, Iterator last, ui
     std::merge(
         entries_.begin(), entries_.begin() + size_before,
         entries_.begin() + size_before, entries_.end(),
-        std::back_inserter(tmp), compare_pairs_by_first_ptr()
+        std::back_inserter(tmp), compare_pairs_by_first()
     );
     std::swap(tmp, entries_);
   }