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-rw-r--r--jstests/core/index/covered/covered_index_simple_1.js87
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diff --git a/jstests/core/index/covered/covered_index_simple_1.js b/jstests/core/index/covered/covered_index_simple_1.js
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+// Cannot implicitly shard accessed collections because queries on a sharded collection are not
+// able to be covered when they aren't on the shard key since the document needs to be fetched in
+// order to apply the SHARDING_FILTER stage.
+// @tags: [
+// assumes_unsharded_collection,
+// ]
+
+// Simple covered index query test
+
+// Include helpers for analyzing explain output.
+load("jstests/libs/analyze_plan.js");
+
+var coll = db.getCollection("covered_simple_1");
+coll.drop();
+for (i = 0; i < 10; i++) {
+ coll.insert({foo: i});
+}
+for (i = 0; i < 10; i++) {
+ coll.insert({foo: i});
+}
+for (i = 0; i < 5; i++) {
+ coll.insert({bar: i});
+}
+coll.insert({foo: "string"});
+coll.insert({foo: {bar: 1}});
+coll.insert({foo: null});
+coll.createIndex({foo: 1});
+
+// Test equality with int value
+var plan = coll.find({foo: 1}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.1 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.1 - docs examined should be 0 for covered query");
+
+// Test equality with string value
+var plan = coll.find({foo: "string"}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.2 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.2 - docs examined should be 0 for covered query");
+
+// Test equality with doc value
+var plan = coll.find({foo: {bar: 1}}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.3 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.3 - docs examined should be 0 for covered query");
+
+// Test no query
+var plan = coll.find({}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.4 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.4 - docs examined should be 0 for covered query");
+
+// Test range query
+var plan =
+ coll.find({foo: {$gt: 2, $lt: 6}}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.5 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.5 - docs examined should be 0 for covered query");
+
+// Test in query
+var plan =
+ coll.find({foo: {$in: [5, 8]}}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.6 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.6 - docs examined should be 0 for covered query");
+
+// Test no return
+var plan = coll.find({foo: "2"}, {foo: 1, _id: 0}).hint({foo: 1}).explain("executionStats");
+assert(isIndexOnly(db, plan.queryPlanner.winningPlan),
+ "simple.1.7 - indexOnly should be true on covered query");
+assert.eq(0,
+ plan.executionStats.totalDocsExamined,
+ "simple.1.7 - nscannedObjects should be 0 for covered query");
+
+print('all tests pass');