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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// Confirm correctness of $cond expression evaluation.
(function() {
"use strict";
load('jstests/aggregation/extras/utils.js');
const coll = db.expressionCond;
coll.drop();
assert.commandWorked(
coll.insert([{_id: 0, year: 1999}, {_id: 1, year: 2021}, {_id: 2, year: 2000}]));
function runAndAssert(condSpec, expectedResult) {
assertArrayEq({
expected: expectedResult,
actual: coll.aggregate([{$project: {year: 1, century: {$cond: condSpec}}}]).toArray()
});
}
function runAndAssertThrows(condSpec, expectedErrorCode) {
assertErrorCode(coll, {$project: {foo: {$cond: condSpec}}}, expectedErrorCode);
}
// Tests non constant condition case.
runAndAssert([{$gt: ["$year", 2000]}, "new", "old"], [
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "new"},
{_id: 2, year: 2000, century: "old"}
]);
// Tests constant true condition case.
runAndAssert([true, {$concat: ["n", "e", "w"]}, "old"], [
{_id: 0, year: 1999, century: "new"},
{_id: 1, year: 2021, century: "new"},
{_id: 2, year: 2000, century: "new"}
]);
// Tests constant false condition case.
runAndAssert([false, "new", {$concat: ["o", "l", "d"]}], [
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "old"},
{_id: 2, year: 2000, century: "old"}
]);
// Tests a case when condition arguments is a constant expression.
runAndAssert([{$eq: ["A", "a"]}, "new", {$concat: ["o", "l", "d"]}], [
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "old"},
{_id: 2, year: 2000, century: "old"}
]);
// Tests a case when condition arguments is null.
runAndAssert([null, "new", "old"], [
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "old"},
{_id: 2, year: 2000, century: "old"}
]);
// Tests a case when condition arguments is undefined.
runAndAssert([undefined, "new", "old"], [
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "old"},
{_id: 2, year: 2000, century: "old"}
]);
// Tests a case when then-arguments is undefined.
runAndAssert([true, undefined, "old"], [
{_id: 0, year: 1999, century: undefined},
{_id: 1, year: 2021, century: undefined},
{_id: 2, year: 2000, century: undefined}
]);
// Tests a case when else-arguments is null.
runAndAssert([undefined, null, null], [
{_id: 0, year: 1999, century: null},
{_id: 1, year: 2021, century: null},
{_id: 2, year: 2000, century: null}
]);
// Tests a case with incorrect arguments.
runAndAssertThrows(["new", "old"], 16020);
runAndAssertThrows([], 16020);
runAndAssertThrows(null, 16020);
runAndAssertThrows(undefined, 16020);
// Tests a normal case using extended syntax.
runAndAssert(
{
if: {$gt: ["$year", 2000]}, then: "new", else: "old"
},
[
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "new"},
{_id: 2, year: 2000, century: "old"}
]);
// Test a case using extended syntax with invalid parameters.
runAndAssertThrows({i: {$gt: ["$year", 2000]}, then: "new", else: "old"}, 17083);
runAndAssertThrows({then: "new", else: "old"}, 17080);
runAndAssertThrows({
if: {$gt: ["$year", 2000]}, else: "old"
}, 17081);
runAndAssertThrows({
if: {$gt: ["$year", 2000]}, then: "new"
}, 17082);
// Tests nested $cond expressions.
runAndAssert(
{
if: {$gt: ["$year", 2000]},
then: "new",
else: {$cond: [{$eq: ["$year", 2000]}, "2000 was in XX century", "old"]}
},
[
{_id: 0, year: 1999, century: "old"},
{_id: 1, year: 2021, century: "new"},
{_id: 2, year: 2000, century: "2000 was in XX century"}
]);
})();
|
