SERVER-46738 Ensure let parameters work for sharded find

1 files changed, 19 insertions, 0 deletions

diff --git a/jstests/core/command_let_variables.js b/jstests/core/command_let_variables.js
index 5f75fb438bd..6baf9a1e99a 100644
--- a/jstests/core/command_let_variables.js
+++ b/jstests/core/command_let_variables.js
@@ -223,4 +223,23 @@ assert.eq(db.runCommand({
                 "let": {variable: "OUTER"}
             }).cursor.firstBatch.length,
           2);
+
+// Test that the find command works correctly with a let parameter argument.
+let result = assert
+                 .commandWorked(db.runCommand({
+                     find: coll.getName(),
+                     let : {target_species: "Song Thrush (Turdus philomelos)"},
+                     filter: {$expr: {$eq: ["$Species", "$$target_species"]}},
+                     projection: {_id: 0}
+                 }))
+                 .cursor.firstBatch;
+expectedResults = {
+    Species: "Song Thrush (Turdus philomelos)",
+    population_trends: [
+        {term: {start: 1970, end: 2014}, pct_change: -53, annual: -1.7, trend: "weak decline"},
+        {term: {start: 2009, end: 2014}, pct_change: -4, annual: -0.88, trend: "no change"}
+    ]
+};
+assert.eq(result.length, 1);
+assert.eq(expectedResults, result[0]);
 }());