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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
|
/**
* Test that $shift works as a window function.
*/
(function() {
"use strict";
load("jstests/aggregation/extras/utils.js"); // documentEq
const coll = db[jsTestName()];
coll.drop();
const nDocs = 10;
for (let i = 0; i < nDocs; i++) {
assert.commandWorked(coll.insert({
one: i,
partition: i % 2,
partitionSeq: Math.trunc(i / 2),
}));
}
const lastDoc = nDocs - 1;
const lastDocInPartition = nDocs / 2 - 1;
const origDocs = coll.find().sort({_id: 1});
function verifyResults(results, valueFunction) {
for (let i = 0; i < results.length; i++) {
// Use Object.assign to make a copy instead of pass a reference.
const correctDoc = valueFunction(i, Object.assign({}, origDocs[i]));
assert(documentEq(correctDoc, results[i]),
"Got: " + tojson(results[i]) + "\nExpected: " + tojson(correctDoc) +
"\n at position " + i + "\n");
}
}
// Run an unpartitioned shift query using the specified offset and default expression.
function runShiftQuery(shiftBy, defaultVal) {
return coll
.aggregate([
{
$setWindowFields: {
sortBy: {one: 1},
output: {a: {$shift: {by: shiftBy, output: "$one", default: defaultVal}}}
}
},
{$sort: {_id: 1}}
])
.toArray();
}
// Run an unpartitioned shift query using the specified offset and the default default expression.
function runShiftQueryWithoutDefault(shiftBy) {
return coll
.aggregate([
{
$setWindowFields:
{sortBy: {one: 1}, output: {a: {$shift: {by: shiftBy, output: "$one"}}}}
},
{$sort: {_id: 1}}
])
.toArray();
}
// Test left shift with default.
let result = runShiftQuery(-1, -10);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == 0)
baseObj.a = -10;
else
baseObj.a = baseObj.one - 1;
return baseObj;
});
// Test left shift without default.
result = runShiftQueryWithoutDefault(-1);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == 0)
baseObj.a = null;
else
baseObj.a = baseObj.one - 1;
return baseObj;
});
// Test 0 shift with default.
result = runShiftQuery(0);
verifyResults(result, function(num, baseObj) {
baseObj.a = baseObj.one;
return baseObj;
});
// Test 0 shift without default.
result = runShiftQueryWithoutDefault(0);
verifyResults(result, function(num, baseObj) {
baseObj.a = baseObj.one;
return baseObj;
});
// Test right shift with default.
result = runShiftQuery(1, -10);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == lastDoc)
baseObj.a = -10;
else
baseObj.a = baseObj.one + 1;
return baseObj;
});
// Test right shift without default.
result = runShiftQueryWithoutDefault(1);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == lastDoc)
baseObj.a = null;
else
baseObj.a = baseObj.one + 1;
return baseObj;
});
// Run an unpartitioned shift query using the specified offset with descending order.
function runShiftQueryDescending(shiftBy) {
return coll
.aggregate([
{
$setWindowFields:
{sortBy: {one: -1}, output: {a: {$shift: {by: shiftBy, output: "$one"}}}}
},
{$sort: {_id: 1}}
])
.toArray();
}
// Test right shift with descending sort.
result = runShiftQueryDescending(1);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == 0)
baseObj.a = null;
else
baseObj.a = baseObj.one - 1;
return baseObj;
});
// Test 0 shift with descending sort.
result = runShiftQueryDescending(0);
verifyResults(result, function(num, baseObj) {
baseObj.a = baseObj.one;
return baseObj;
});
// Test left shift with descending sort.
result = runShiftQueryDescending(-1);
verifyResults(result, function(num, baseObj) {
if (baseObj.one == lastDoc)
baseObj.a = null;
else
baseObj.a = baseObj.one + 1;
return baseObj;
});
// Run a shift query partitioned over "$partition" using the specified shift and default
// default expression.
//
// Partitioning is odd/even.
function runPartitionedShiftQuery(shiftBy) {
return coll
.aggregate([
{
$setWindowFields: {
partitionBy: "$partition",
sortBy: {one: 1},
output: {a: {$shift: {by: shiftBy, output: "$one"}}}
}
},
{$sort: {_id: 1}}
])
.toArray();
}
// Test partitioned left shift.
result = runPartitionedShiftQuery(-1);
verifyResults(result, function(num, baseObj) {
if (baseObj.partitionSeq == 0)
baseObj.a = null;
else
// partitioning is even/odd.
baseObj.a = baseObj.one - 2;
return baseObj;
});
// Test partitioned right shift.
result = runPartitionedShiftQuery(1);
verifyResults(result, function(num, baseObj) {
if (baseObj.partitionSeq == lastDocInPartition)
baseObj.a = null;
else
// partitioning is even/odd.
baseObj.a = baseObj.one + 2;
return baseObj;
});
// Test partitioned 0 shift.
result = runPartitionedShiftQuery(0);
verifyResults(result, function(num, baseObj) {
baseObj.a = baseObj.one;
return baseObj;
});
// Run a shift query partitioned over "$partition" using the specified shift and default
// default expression with a descending sort.
//
// Partitioning is odd/even.
function runPartitionedShiftQueryDescending(shiftBy) {
return coll
.aggregate([
{
$setWindowFields: {
partitionBy: "$partition",
sortBy: {one: -1},
output: {a: {$shift: {by: shiftBy, output: "$one"}}}
}
},
{$sort: {_id: 1}}
])
.toArray();
}
// Test partitioned left shift with descending sort.
result = runPartitionedShiftQueryDescending(-1);
verifyResults(result, function(num, baseObj) {
if (baseObj.partitionSeq == lastDocInPartition)
baseObj.a = null;
else
// partitioning is even/odd.
baseObj.a = baseObj.one + 2;
return baseObj;
});
// Test partitioned right shift with descending sort.
result = runPartitionedShiftQueryDescending(1);
verifyResults(result, function(num, baseObj) {
if (baseObj.partitionSeq == 0)
baseObj.a = null;
else
// partitioning is even/odd.
baseObj.a = baseObj.one - 2;
return baseObj;
});
// Test partitioned 0 shift with descending sort.
result = runPartitionedShiftQuery(0);
verifyResults(result, function(num, baseObj) {
baseObj.a = baseObj.one;
return baseObj;
});
/* Parsing tests */
// "by" is required.
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{$setWindowFields: {sortBy: {one: 1}, output: {a: {$shift: {output: "$one"}}}}}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// Can't accept a string for "by".
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline:
[{$setWindowFields: {sortBy: {one: 1}, output: {a: {$shift: {by: "1", output: "$one"}}}}}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// Can't accept an expression for "by".
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{
$setWindowFields:
{sortBy: {one: 1}, output: {a: {$shift: {by: {$sum: [1, 1]}, output: "$one"}}}}
}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// Can't accept a float for "by".
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline:
[{$setWindowFields: {sortBy: {one: 1}, output: {a: {$shift: {by: 1.1, output: "$one"}}}}}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// Can't accept a float for "by" ... unless it converts to int without loss of precision.
assert.commandWorked(coll.runCommand({
aggregate: coll.getName(),
pipeline:
[{$setWindowFields: {sortBy: {one: 1}, output: {a: {$shift: {by: 1.0, output: "$one"}}}}}],
cursor: {}
}));
// "output" is required.
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{$setWindowFields: {sortBy: {one: 1}, output: {a: {$shift: {by: 1}}}}}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// "default" must evaluate to a constant.
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{
$setWindowFields:
{sortBy: {one: 1}, output: {a: {$shift: {by: 1, output: "$one", default: "$one"}}}}
}],
cursor: {}
}),
ErrorCodes.FailedToParse);
// "default" may be an arbitrary expression as long as it evaluates to a constant.
assert.commandWorked(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{
$setWindowFields: {
sortBy: {one: 1},
output: {a: {$shift: {by: 1, output: "$one", default: {$add: [1, 1]}}}}
}
}],
cursor: {}
}));
// "sortBy" is required for $shift.
assert.commandFailedWithCode(coll.runCommand({
aggregate: coll.getName(),
pipeline: [{$setWindowFields: {output: {a: {$shift: {by: 1, output: "$one"}}}}}],
cursor: {}
}),
ErrorCodes.FailedToParse);
})();
|
