1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// Test the planCacheListQueryShapes command, which returns a list of query shapes
// for the queries currently cached in the collection.
//
// @tags: [
// # This test attempts to perform queries with plan cache filters set up. The former operation
// # may be routed to a secondary in the replica set, whereas the latter must be routed to the
// # primary.
// assumes_read_preference_unchanged,
// does_not_support_stepdowns,
// ]
(function() {
const t = db.jstests_plan_cache_list_shapes;
t.drop();
// Utility function to list query shapes in cache.
function getShapes(collection) {
if (collection === undefined) {
collection = t;
}
const res = collection.runCommand('planCacheListQueryShapes');
print('planCacheListQueryShapes() = ' + tojson(res));
assert.commandWorked(res, 'planCacheListQueryShapes failed');
assert(res.hasOwnProperty('shapes'), 'shapes missing from planCacheListQueryShapes result');
return res.shapes;
}
// Attempting to retrieve cache information on non-existent collection is not an error and
// should return an empty array of query shapes.
const missingCollection = db.jstests_query_cache_missing;
missingCollection.drop();
assert.eq(0,
getShapes(missingCollection).length,
'planCacheListQueryShapes should return empty array on non-existent collection');
assert.commandWorked(t.save({a: 1, b: 1}));
assert.commandWorked(t.save({a: 1, b: 2}));
assert.commandWorked(t.save({a: 1, b: 2}));
assert.commandWorked(t.save({a: 2, b: 2}));
// We need two indices so that the MultiPlanRunner is executed.
assert.commandWorked(t.ensureIndex({a: 1}));
assert.commandWorked(t.ensureIndex({a: 1, b: 1}));
// Run a query.
assert.eq(1,
t.find({a: 1, b: 1}, {_id: 1, a: 1}).sort({a: -1}).itcount(),
'unexpected document count');
// We now expect the two indices to be compared and a cache entry to exist. Retrieve query
// shapes from the test collection Number of shapes should match queries executed by multi-plan
// runner.
let shapes = getShapes();
assert.eq(1, shapes.length, 'unexpected number of shapes in planCacheListQueryShapes result');
// Since the queryHash is computed in the server, we filter it out when matching query shapes
// here.
let filteredShape0 = shapes[0];
delete filteredShape0.queryHash;
assert.eq({query: {a: 1, b: 1}, sort: {a: -1}, projection: {_id: 1, a: 1}},
filteredShape0,
'unexpected query shape returned from planCacheListQueryShapes');
// Running a different query shape should cause another entry to be cached.
assert.eq(1, t.find({a: 1, b: 1}).itcount(), 'unexpected document count');
shapes = getShapes();
assert.eq(2, shapes.length, 'unexpected number of shapes in planCacheListQueryShapes result');
// Check that each shape has a unique queryHash.
assert.neq(shapes[0]["queryHash"], shapes[1]["queryHash"]);
// Check that queries with different regex options have distinct shapes.
// Insert some documents with strings so we have something to search for.
for (let i = 0; i < 5; i++) {
assert.commandWorked(t.insert({a: 3, s: 'hello world'}));
}
assert.commandWorked(t.insert({a: 3, s: 'hElLo wOrLd'}));
// Run a query with a regex. Also must include 'a' so that the query may use more than one
// index, and thus, must use the MultiPlanner.
const regexQuery = {s: {$regex: 'hello world', $options: 'm'}, a: 3};
assert.eq(5, t.find(regexQuery).itcount());
assert.eq(
3, getShapes().length, 'unexpected number of shapes in planCacheListQueryShapes result ');
// Run the same query, but with different regex options. We expect that this should cause a
// shape to get added.
regexQuery.s.$options = 'mi';
// There is one more result since the query is now case sensitive.
assert.eq(6, t.find(regexQuery).itcount());
assert.eq(
4, getShapes().length, 'unexpected number of shapes in planCacheListQueryShapes result');
})();
|
