1 files changed, 53 insertions, 0 deletions
diff --git a/jstests/core/index/fts/fts_array.js b/jstests/core/index/fts/fts_array.js
new file mode 100644
index 00000000000..93d4ba1cfb8
--- /dev/null
+++ b/jstests/core/index/fts/fts_array.js
@@ -0,0 +1,53 @@
+/**
+ * Tests for the interaction between FTS indexes and arrays.
+ */
+(function() {
+"use strict";
+
+let coll = db.jstests_fts_array;
+coll.drop();
+assert.commandWorked(coll.createIndex({"a.b": 1, words: "text"}));
+
+// Verify that the leading field of the index cannot contain an array.
+assert.writeErrorWithCode(coll.insert({a: {b: []}, words: "omnibus"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({a: {b: [1]}, words: "omnibus"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({a: {b: [1, 2]}, words: "omnibus"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({a: [], words: "omnibus"}), ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({a: [{b: 1}], words: "omnibus"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({a: [{b: 1}, {b: 2}], words: "omnibus"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+
+coll.drop();
+assert.commandWorked(coll.createIndex({words: "text", "y.z": 1}));
+
+// Verify that the trailing field of the index cannot contain an array.
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: {z: []}}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: {z: [1]}}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: {z: [1, 2]}}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: []}), ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: [{z: 1}]}),
+                          ErrorCodes.CannotBuildIndexKeys);
+assert.writeErrorWithCode(coll.insert({words: "macerate", y: [{z: 1}, {z: 2}]}),
+                          ErrorCodes.CannotBuildIndexKeys);
+
+// Verify that array fields are allowed when positionally indexed.
+coll.drop();
+assert.commandWorked(coll.createIndex({"a.0": 1, words: "text"}));
+assert.commandWorked(coll.insert({a: [0, 1, 2], words: "dander"}));
+assert.eq({a: [0, 1, 2], words: "dander"},
+          coll.findOne({"a.0": 0, $text: {$search: "dander"}}, {_id: 0, a: 1, words: 1}));
+assert.writeErrorWithCode(coll.insert({a: [[8, 9], 1, 2], words: "dander"}),
+                          ErrorCodes.CannotBuildIndexKeys);
+coll.drop();
+assert.commandWorked(coll.createIndex({"a.0.1": 1, words: "text"}));
+assert.commandWorked(coll.insert({a: [[8, 9], 1, 2], words: "dander"}));
+assert.eq({a: [[8, 9], 1, 2], words: "dander"},
+          coll.findOne({"a.0.1": 9, $text: {$search: "dander"}}, {_id: 0, a: 1, words: 1}));
+}());