1 files changed, 27 insertions, 0 deletions
diff --git a/jstests/aggregation/unwind_sort.js b/jstests/aggregation/unwind_sort.js
new file mode 100644
index 00000000000..858320bec0d
--- /dev/null
+++ b/jstests/aggregation/unwind_sort.js
@@ -0,0 +1,27 @@
+// Test that we can sort on fields, produces by unwind
+
+const coll = db.agg_unwind_sort;
+coll.drop();
+assert.commandWorked(coll.insertOne({a: [3, 4, 5]}));
+assert.commandWorked(coll.insertOne({a: [1, 2]}));
+
+let result = coll.aggregate([{$unwind: "$a"}, {$sort: {a: 1}}]).toArray();
+assert.eq([1, 2, 3, 4, 5], result.map(function(z) {
+    return z.a;
+}));
+result = coll.aggregate([{$unwind: "$a"}, {$sort: {a: -1}}]).toArray();
+assert.eq([5, 4, 3, 2, 1], result.map(function(z) {
+    return z.a;
+}));
+result =
+    coll.aggregate([{$unwind: {path: "$a", includeArrayIndex: "i"}}, {$sort: {i: 1}}]).toArray();
+assert.eq([NumberLong(0), NumberLong(0), NumberLong(1), NumberLong(1), NumberLong(2)],
+          result.map(function(z) {
+              return z.i;
+          }));
+result =
+    coll.aggregate([{$unwind: {path: "$a", includeArrayIndex: "i"}}, {$sort: {i: -1}}]).toArray();
+assert.eq([NumberLong(2), NumberLong(1), NumberLong(1), NumberLong(0), NumberLong(0)],
+          result.map(function(z) {
+              return z.i;
+          }));