Update upstream source from tag 'upstream/6.0.10'debian/6.0.10-1

Update to upstream version '6.0.10'
with Debian dir 2d176fa254eee97b139f712fec5709641335a8c3

1 files changed, 60 insertions, 0 deletions

diff --git a/src/mongo/db/pipeline/monotonic_expression.cpp b/src/mongo/db/pipeline/monotonic_expression.cpp
new file mode 100644
index 00000000000..bc34b756fec
--- /dev/null
+++ b/src/mongo/db/pipeline/monotonic_expression.cpp
@@ -0,0 +1,60 @@
+/**
+ *    Copyright (C) 2022-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the Server Side Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/db/pipeline/monotonic_expression.h"
+
+namespace mongo::monotonic {
+
+State opposite(State state) {
+    switch (state) {
+        case State::NonMonotonic:
+        case State::Constant:
+            return state;
+        case State::Increasing:
+            return State::Decreasing;
+        case State::Decreasing:
+            return State::Increasing;
+    };
+    MONGO_UNREACHABLE;
+}
+
+State combine(State lhs, State rhs) {
+    if (lhs == State::NonMonotonic || rhs == State::NonMonotonic) {
+        return State::NonMonotonic;
+    }
+    if (lhs == rhs || lhs == State::Constant) {
+        return rhs;
+    }
+    if (rhs == State::Constant) {
+        return lhs;
+    }
+    return State::NonMonotonic;
+}
+
+}  // namespace mongo::monotonic