SERVER-53714 Add removable $min/$max window functions

1 files changed, 9 insertions, 0 deletions

diff --git a/src/mongo/db/exec/document_value/value_comparator.h b/src/mongo/db/exec/document_value/value_comparator.h
index 0ab008df31d..85858802f16 100644
--- a/src/mongo/db/exec/document_value/value_comparator.h
+++ b/src/mongo/db/exec/document_value/value_comparator.h
@@ -158,6 +158,14 @@ public:
     }
 
     /**
+     * Construct an empty ordered multiset of Values whose ordering and equivalence classes are
+     * given by this comparator. This comparator must outlive the returned set.
+     */
+    std::multiset<Value, LessThan> makeOrderedValueMultiset() const {
+        return std::multiset<Value, LessThan>(LessThan(this));
+    }
+
+    /**
      * Construct an empty unordered set of Values whose equivalence classes are given by this
      * comparator. This comparator must outlive the returned set.
      */
@@ -192,6 +200,7 @@ private:
 //
 
 using ValueSet = std::set<Value, ValueComparator::LessThan>;
+using ValueMultiset = std::multiset<Value, ValueComparator::LessThan>;
 
 using ValueUnorderedSet =
     stdx::unordered_set<Value, ValueComparator::Hasher, ValueComparator::EqualTo>;