SERVER-63012 Initialize '$add' with no operands to zero when translating to SBE

1 files changed, 12 insertions, 0 deletions

diff --git a/jstests/aggregation/expressions/add_empty.js b/jstests/aggregation/expressions/add_empty.js
new file mode 100644
index 00000000000..99faaf417f3
--- /dev/null
+++ b/jstests/aggregation/expressions/add_empty.js
@@ -0,0 +1,12 @@
+// In SERVER-63012, translation of $add expression into sbe now defaults the translation of $add
+// with no operands to a zero integer constant.
+(function() {
+"use strict";
+
+const coll = db.add_empty;
+coll.drop();
+
+assert.commandWorked(coll.insert({x: 1}));
+let result = coll.aggregate([{$project: {y: {$add: []}}}]).toArray();
+assert.eq(result[0]["y"], 0);
+}());