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// Simple covered index query test with sort
// Include helpers for analyzing explain output.
load("jstests/libs/analyze_plan.js");
var coll = db.getCollection("covered_sort_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:"1"});
coll.insert({foo:{bar:1}});
coll.insert({foo:null});
coll.ensureIndex({foo:1});
// Test no query and sort ascending
var plan = coll.find({}, {foo:1, _id:0}).sort({foo:1}).hint({foo:1}).explain("executionStats");
assert(isIndexOnly(plan.queryPlanner.winningPlan),
"sort.1.1 - indexOnly should be true on covered query");
assert.eq(0, plan.executionStats.totalDocsExamined,
"sort.1.1 - docs examined should be 0 for covered query");
// Test no query and sort descending
var plan = coll.find({}, {foo:1, _id:0}).sort({foo:-1}).hint({foo:1}).explain("executionStats");
assert(isIndexOnly(plan.queryPlanner.winningPlan),
"sort.1.2 - indexOnly should be true on covered query");
assert.eq(0, plan.executionStats.totalDocsExamined,
"sort.1.2 - docs examined should be 0 for covered query");
// Test range query with sort
var plan = coll.find({foo:{$gt:2}}, {foo:1, _id:0}).sort({foo:-1})
.hint({foo:1})
.explain("executionStats");
assert(isIndexOnly(plan.queryPlanner.winningPlan),
"sort.1.3 - indexOnly should be true on covered query");
assert.eq(0, plan.executionStats.totalDocsExamined,
"sort.1.3 - docs examined should be 0 for covered query");
print ('all tests pass');
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