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/**
* Tests correctness of output of pushing $lookup into the find layer.
*/
(function() {
"use strict";
load("jstests/libs/sbe_util.js"); // For 'checkSBEEnabled()'.
load("jstests/aggregation/extras/utils.js");
// Standalone cases.
const conn = MongoRunner.runMongod({setParameter: "featureFlagSBELookupPushdown=true"});
assert.neq(null, conn, "mongod was unable to start up");
const db = conn.getDB("lookup_pushdown");
if (!checkSBEEnabled(db, ["featureFlagSBELookupPushdown"])) {
jsTestLog("Skipping test because either the sbe lookup pushdown feature flag is disabled or" +
" sbe itself is disabled");
MongoRunner.stopMongod(conn);
return;
}
const localColl = db["lookup_pushdown_local"];
const foreignColl = db["lookup_pushdown_foreign"];
/**
* Executes $lookup with exactly one record in the foreign collection, so we don't need to check the
* content of the "as" field but only that it's not empty for local records with ids in
* 'idsExpectToMatch'.
*/
function runTest_SingleForeignRecord({
testDescription,
localRecords,
localField,
foreignRecord,
foreignField,
foreignIndex,
idsExpectedToMatch
}) {
assert('object' === typeof (foreignRecord) && !Array.isArray(foreignRecord),
"foreignRecord should be a single document");
localColl.drop();
assert.commandWorked(localColl.insert(localRecords));
foreignColl.drop();
assert.commandWorked(foreignColl.insert(foreignRecord));
if (foreignIndex) {
assert.commandWorked(foreignColl.createIndex(foreignIndex));
}
const results = localColl.aggregate([{
$lookup: {
from: foreignColl.getName(),
localField: localField,
foreignField: foreignField,
as: "matched"
}
}]).toArray();
// Build the array of ids for the results that have non-empty array in the "matched" field.
const matchedIds = results
.filter(function(x) {
return tojson(x.matched) != tojson([]);
})
.map(x => (x._id));
// Order of the elements within the arrays is not significant for 'assertArrayEq'.
assertArrayEq({
actual: matchedIds,
expected: idsExpectedToMatch,
extraErrorMsg: " **TEST** " + testDescription
});
}
/**
* Executes $lookup with exactly one record in the local collection and checks that the "as" field
* for it contains documents with ids from `idsExpectedToMatch`.
*/
function runTest_SingleLocalRecord({
testDescription,
localRecord,
localField,
foreignRecords,
foreignField,
foreignIndex,
idsExpectedToMatch
}) {
assert('object' === typeof (localRecord) && !Array.isArray(localRecord),
"localRecord should be a single document");
localColl.drop();
assert.commandWorked(localColl.insert(localRecord));
foreignColl.drop();
assert.commandWorked(foreignColl.insert(foreignRecords));
if (foreignIndex) {
assert.commandWorked(foreignColl.createIndex(foreignIndex));
}
const results = localColl.aggregate([{
$lookup: {
from: foreignColl.getName(),
localField: localField,
foreignField: foreignField,
as: "matched"
}
}]).toArray();
assert.eq(1, results.length);
// Extract matched foreign ids from the "matched" field.
const matchedIds = results[0].matched.map(x => x._id);
// Order of the elements within the arrays is not significant for 'assertArrayEq'.
assertArrayEq({
actual: matchedIds,
expected: idsExpectedToMatch,
extraErrorMsg: " **TEST** " + testDescription
});
}
(function testMatchingTopLevelFieldToScalar() {
const docs = [
{_id: 0, a: NumberInt(0)},
{_id: 1, a: 3.14},
{_id: 2, a: NumberDecimal(3.14)},
{_id: 3, a: "abc"},
];
docs.forEach(doc => {
runTest_SingleForeignRecord({
testDescription:
"Top-level field in local and top-level scalar in foreign with index on foreign field and produces single match",
localRecords: docs,
localField: "a",
foreignRecord: {b: doc.a},
foreignField: "b",
foreignIndex: {b: 1},
idsExpectedToMatch: [doc._id]
});
runTest_SingleLocalRecord({
testDescription:
"Top-level scalar in local and top-level field in foreign with index on foreign field and produces single match",
localRecord: {b: doc.a},
localField: "b",
foreignRecords: docs,
foreignField: "a",
foreignIndex: {a: 1},
idsExpectedToMatch: [doc._id]
});
});
runTest_SingleForeignRecord({
testDescription:
"Top-level field in local and top-level scalar in foreign with index on foreign field and produces no match",
localRecords: docs,
localField: "a",
foreignRecord: {b: 'xxx'},
foreignField: "b",
foreignIndex: {b: 1},
idsExpectedToMatch: []
});
runTest_SingleLocalRecord({
testDescription:
"Top-level scalar in local and top-level field in foreign with index on foreign field and produces no match",
localRecord: {b: 'xxx'},
localField: "b",
foreignRecords: docs,
foreignField: "a",
foreignIndex: {a: 1},
idsExpectedToMatch: []
});
})();
MongoRunner.stopMongod(conn);
}());
|
