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/**
* Tests for the $lookup stage with sub-pipeline syntax and localField/foreignField syntax.
*
* Accessed collections cannot be implicitly sharded because you cannot $lookup into a sharded
* collection.
* @tags: [
* assumes_unsharded_collection,
* sbe_incompatible
* ]
*/
(function() {
"use strict";
const testDB = db.getSiblingDB(jsTestName());
assert(testDB.dropDatabase());
const locations = testDB.locations;
assert.commandWorked(locations.insert([
{
_id: "doghouse",
coordinates: [25.0, 60.0],
extra: {breeds: ["terrier", "dachshund", "bulldog"]}
},
{
_id: "bullpen",
coordinates: [-25.0, -60.0],
extra: {breeds: "Scottish Highland", feeling: "bullish"}
},
{_id: "puppyhouse", coordinates: [-25.0, 60.0], extra: {breeds: 1,
feeling: ["cute", "small"]}}
]));
const animals = testDB.animals;
assert.commandWorked(animals.insert([
{_id: "dog", locationId: "doghouse"},
{_id: "bull", locationId: "bullpen"},
{_id: "puppy", locationId: "puppyhouse", breed: 1}
]));
// Test that a simple $lookup with $let works as expected, when local/foreignField and
// pipeline are specified.
let result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
let: { animal_breed: "$breed" },
pipeline: [{$match: { $expr: {$eq: ["$$animal_breed", "$extra.breeds"]}}}],
}
},
])
.toArray();
let expected = [
{_id: "dog", locationId: "doghouse", location: []},
{_id: "bull", locationId: "bullpen", location: []},
{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: [{
_id: "puppyhouse",
coordinates: [-25.0, 60.0],
extra: {breeds: 1, feeling: ["cute", "small"]}
}]
}
];
assert.sameMembers(result, expected);
// Test that a simple $lookup without $let works as expected, when local/foreignField and
// pipeline are specified.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
pipeline: [{$match: {$expr: {$in: [-25.0, "$coordinates"]}}}]
}
},
])
.toArray();
expected = [
{_id: "dog", locationId: "doghouse", location: []},
{
_id: "bull",
locationId: "bullpen",
location: [{
_id: "bullpen",
coordinates: [-25.0, -60.0],
extra: {breeds: "Scottish Highland", feeling: "bullish"}
}]
},
{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: [{
_id: "puppyhouse",
coordinates: [-25.0, 60.0],
extra: {breeds: 1, feeling: ["cute", "small"]}
}]
}
];
assert.sameMembers(result, expected);
// Test that a $lookup works as expected when it absorbs a following unwind and filter on 'as',
// when local/foreignField and pipeline are specified.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
let: { animal: "$_id" },
pipeline: [{$match: {$expr: {$in: [-25.0, "$coordinates"]}}}],
}
},
{$unwind: "$location"},
{
$match: {
"location.extra.feeling": {
$type: "array"
}
}
},
{$project: {"location.extra": false}}
])
.toArray();
expected = [{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: {_id: "puppyhouse", coordinates: [-25.0, 60.0]}
}];
assert.eq(result, expected);
// Test that a $lookup works as expected when it absorbs a following unwind and part of a filter
// on 'as', when local/foreignField and pipeline are specified.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
let: { animal: "$_id" },
pipeline: [{$set: {"extra.unrelated": "$_id" }}],
}
},
{$unwind: "$location"},
{
$match: {
"location.extra.feeling": {
$exists: true
},
"breed": {
$eq: 1
}
}
},
{$project: {"location.extra": false}}
])
.toArray();
expected = [{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: {_id: "puppyhouse", coordinates: [-25.0, 60.0]}
}];
assert.eq(result, expected);
// Test that a more complex $match with $jsonSchema works as expected although ineligable for
// absorbtion by a $lookup.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
pipeline: [{$match: {$expr: {$in: [60.0, "$coordinates"]}}}],
}
},
{$unwind: "$location"},
{
$match: {
$jsonSchema: {
properties: {location: {properties: {extra: {minProperties: 2}}}}
}
}
},
{$project: {"location.extra": false}}
])
.toArray();
expected = [{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: {_id: "puppyhouse", coordinates: [-25.0, 60.0]}
}];
assert.eq(result, expected);
// Test that $lookup from a view works as expected when local/foreignField and
// pipeline are specified.
assert.commandWorked(testDB.createView(
"view",
"locations",
[{$set: {my_id: "$_id"}}, {$match: {$expr: {$in: [-25.0, "$coordinates"]}}}]));
result = testDB.animals.aggregate([
{
$lookup: {
from: "view",
localField: "locationId",
foreignField: "my_id",
as: "location",
pipeline: [{$match: {$expr: {$in: [60.0, "$coordinates"]}}}]
}
},
]).toArray();
expected = [
{_id: "dog", locationId: "doghouse", location: []},
{_id: "bull", locationId: "bullpen", location: []},
{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: [{
_id: "puppyhouse",
coordinates: [-25.0, 60.0],
extra: {breeds: 1, feeling: ["cute", "small"]},
my_id: "puppyhouse"
}]
}
];
assert.sameMembers(result, expected);
// Tests that the $match corresponding to the local/foreignField is executed before the user
// pipeline.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
pipeline: [{$project: {_id: "doghouse"}}]
},
}
])
.toArray();
expected = [
{_id: "dog", locationId: "doghouse", location: [{_id: "doghouse"}]},
{_id: "bull", locationId: "bullpen", location: [{_id: "doghouse"}]},
{_id: "puppy", locationId: "puppyhouse", breed: 1, location: [{_id: "doghouse"}]}
];
assert.sameMembers(result, expected);
// Tests that an absorbed $unwind and $match that depend on user-specified pipeline works as
// expected.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
pipeline: [{$set: {my_field: "$_id"}}]
},
},
{$unwind: "$location"},
{$match: {'location.my_field': "doghouse"}}
])
.toArray();
expected = [{
_id: "dog",
locationId: "doghouse",
location: {
_id: "doghouse",
coordinates: [25.0, 60.0],
extra: {breeds: ["terrier", "dachshund", "bulldog"]},
my_field: "doghouse"
}
}];
assert.sameMembers(result, expected);
// Tests that an absorbed $unwind and multiple $match's that depend on user-specified pipeline works
// as expected.
result = testDB.animals
.aggregate([
{
$lookup: {
from: "locations",
localField: "locationId",
foreignField: "_id",
as: "location",
pipeline: [{$set: {my_field: "$_id"}}]
},
},
{$unwind: "$location"},
{$match: {'location.my_field': "puppyhouse"}},
{$match: {
"location.extra.feeling": {
$type: "array"
}
}}
])
.toArray();
expected = [{
_id: "puppy",
locationId: "puppyhouse",
breed: 1,
location: {
_id: "puppyhouse",
coordinates: [-25.0, 60.0],
extra: {breeds: 1, feeling: ["cute", "small"]},
my_field: "puppyhouse"
}
}];
assert.sameMembers(result, expected);
}());
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