706ac90265
The default ShardingTest verbosity is currently zero, but we have many tests, which bump it to 1 and even higher. Since verbosity level of 0 is sometimes insufficient for investigating transient failures, this change makes the default to be 1 and removes all places, which explicitly make it 1 or higher.
454 lines
15 KiB
JavaScript
454 lines
15 KiB
JavaScript
// SERVER-19095: Add $lookup aggregation stage.
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// For assertErrorCode.
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load("jstests/aggregation/extras/utils.js");
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(function() {
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"use strict";
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// Used by testPipeline to sort result documents. All _ids must be primitives.
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function compareId(a, b) {
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if (a._id < b._id) {
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return -1;
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}
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if (a._id > b._id) {
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return 1;
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}
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return 0;
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}
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// Helper for testing that pipeline returns correct set of results.
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function testPipeline(pipeline, expectedResult, collection) {
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assert.eq(collection.aggregate(pipeline).toArray().sort(compareId),
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expectedResult.sort(compareId));
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}
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function runTest(coll, from) {
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var db = null; // Using the db variable is banned in this function.
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assert.writeOK(coll.insert({_id: 0, a: 1}));
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assert.writeOK(coll.insert({_id: 1, a: null}));
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assert.writeOK(coll.insert({_id: 2}));
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assert.writeOK(from.insert({_id: 0, b: 1}));
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assert.writeOK(from.insert({_id: 1, b: null}));
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assert.writeOK(from.insert({_id: 2}));
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//
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// Basic functionality.
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//
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// "from" document added to "as" field if a == b, where nonexistent fields are treated as
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// null.
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var expectedResults = [
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{_id: 0, a: 1, "same": [{_id: 0, b: 1}]},
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{_id: 1, a: null, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "same": [{_id: 1, b: null}, {_id: 2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}], expectedResults, coll);
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// If localField is nonexistent, it is treated as if it is null.
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expectedResults = [
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{_id: 0, a: 1, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 1, a: null, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "same": [{_id: 1, b: null}, {_id: 2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "nonexistent",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}], expectedResults, coll);
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// If foreignField is nonexistent, it is treated as if it is null.
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expectedResults = [
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{_id: 0, a: 1, "same": []},
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{_id: 1, a: null, "same": [{_id: 0, b: 1}, {_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "same": [{_id: 0, b: 1}, {_id: 1, b: null}, {_id: 2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "nonexistent",
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from: "from",
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as: "same"
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}
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}], expectedResults, coll);
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// If there are no matches or the from coll doesn't exist, the result is an empty array.
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expectedResults = [
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{_id: 0, a: 1, "same": []},
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{_id: 1, a: null, "same": []},
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{_id: 2, "same": []}
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];
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testPipeline([{
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$lookup: {
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localField: "_id",
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foreignField: "nonexistent",
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from: "from",
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as: "same"
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}
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}], expectedResults, coll);
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "nonexistent",
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as: "same"
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}
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}], expectedResults, coll);
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// If field name specified by "as" already exists, it is overwritten.
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expectedResults = [
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{_id: 0, "a": [{_id: 0, b: 1}]},
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{_id: 1, "a": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "a": [{_id: 1, b: null}, {_id: 2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "a"
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}
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}], expectedResults, coll);
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// Running multiple $lookups in the same pipeline is allowed.
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expectedResults = [
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{_id: 0, a: 1, "c": [{_id:0, b:1}], "d": [{_id:0, b:1}]},
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{_id: 1, a: null, "c": [{_id:1, b:null}, {_id:2}], "d": [{_id:1, b:null}, {_id:2}]},
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{_id: 2, "c": [{_id:1, b:null}, {_id:2}], "d": [{_id:1, b:null}, {_id:2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "c"
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}
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}, {
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$project: {
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"a": 1,
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"c": 1
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}
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}, {
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "d"
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}
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}], expectedResults, coll);
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//
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// Coalescing with $unwind.
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//
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// A normal $unwind with on the "as" field.
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expectedResults = [
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{_id: 0, a: 1, same: {_id: 0, b: 1}},
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{_id: 1, a: null, same: {_id: 1, b: null}},
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{_id: 1, a: null, same: {_id: 2}},
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{_id: 2, same: {_id: 1, b: null}},
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{_id: 2, same: {_id: 2}}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {path: "$same"}
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}], expectedResults, coll);
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// An $unwind on the "as" field, with includeArrayIndex.
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expectedResults = [
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{_id: 0, a: 1, same: {_id: 0, b: 1}, index: NumberLong(0)},
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{_id: 1, a: null, same: {_id: 1, b: null}, index: NumberLong(0)},
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{_id: 1, a: null, same: {_id: 2}, index: NumberLong(1)},
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{_id: 2, same: {_id: 1, b: null}, index: NumberLong(0)},
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{_id: 2, same: {_id: 2}, index: NumberLong(1)},
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {
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path: "$same",
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includeArrayIndex: "index"
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}
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}], expectedResults, coll);
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// Normal $unwind with no matching documents.
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expectedResults = [];
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testPipeline([{
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$lookup: {
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localField: "_id",
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foreignField: "nonexistent",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {path: "$same"}
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}], expectedResults, coll);
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// $unwind with preserveNullAndEmptyArray with no matching documents.
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expectedResults = [
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{_id: 0, a: 1},
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{_id: 1, a: null},
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{_id: 2},
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];
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testPipeline([{
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$lookup: {
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localField: "_id",
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foreignField: "nonexistent",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {
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path: "$same",
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preserveNullAndEmptyArrays: true
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}
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}], expectedResults, coll);
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// $unwind with preserveNullAndEmptyArray, some with matching documents, some without.
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expectedResults = [
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{_id: 0, a: 1},
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{_id: 1, a: null, same: {_id: 0, b: 1}},
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{_id: 2},
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];
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testPipeline([{
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$lookup: {
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localField: "_id",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {
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path: "$same",
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preserveNullAndEmptyArrays: true
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}
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}], expectedResults, coll);
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// $unwind with preserveNullAndEmptyArray and includeArrayIndex, some with matching
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// documents, some without.
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expectedResults = [
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{_id: 0, a: 1, index: null},
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{_id: 1, a: null, same: {_id: 0, b: 1}, index: NumberLong(0)},
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{_id: 2, index: null},
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];
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testPipeline([{
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$lookup: {
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localField: "_id",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}, {
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$unwind: {
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path: "$same",
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preserveNullAndEmptyArrays: true,
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includeArrayIndex: "index"
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}
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}], expectedResults, coll);
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//
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// Dependencies.
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//
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// If $lookup didn't add "localField" to its dependencies, this test would fail as the
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// value of the "a" field would be lost and treated as null.
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expectedResults = [
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{_id: 0, "same": [{_id: 0, b: 1}]},
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{_id: 1, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "same": [{_id: 1, b: null}, {_id: 2}]}
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];
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testPipeline([{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}, {
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$project: {
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"same": 1
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}
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}], expectedResults, coll);
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//
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// Dotted field paths.
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//
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coll.drop();
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assert.writeOK(coll.insert({_id: 0, a: 1}));
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assert.writeOK(coll.insert({_id: 1, a: null}));
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assert.writeOK(coll.insert({_id: 2}));
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assert.writeOK(coll.insert({_id: 3, a: {c: 1}}));
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from.drop();
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assert.writeOK(from.insert({_id: 0, b: 1}));
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assert.writeOK(from.insert({_id: 1, b: null}));
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assert.writeOK(from.insert({_id: 2}));
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assert.writeOK(from.insert({_id: 3, b: {c: 1}}));
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assert.writeOK(from.insert({_id: 4, b: {c: 2}}));
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// Once without a dotted field.
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var pipeline = [{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}];
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expectedResults = [
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{_id: 0, a: 1, "same": [{_id: 0, b: 1}]},
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{_id: 1, a: null, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 2, "same": [{_id: 1, b: null}, {_id: 2}]},
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{_id: 3, a: {c: 1}, "same": [{_id: 3, b: {c: 1}}]}
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];
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testPipeline(pipeline, expectedResults, coll);
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// Look up a dotted field.
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pipeline = [{
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$lookup: {
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localField: "a.c",
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foreignField: "b.c",
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from: "from",
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as: "same"
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}
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}];
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// All but the last document in 'coll' have a nullish value for 'a.c'.
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expectedResults = [
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{_id: 0, a: 1, same: [{_id: 0, b: 1}, {_id: 1, b: null}, {_id: 2}]},
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{_id: 1, a: null, same: [{_id: 0, b: 1}, {_id: 1, b: null}, {_id: 2}]},
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{_id: 2, same: [{_id: 0, b: 1}, {_id: 1, b: null}, {_id: 2}]},
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{_id: 3, a: {c: 1}, same: [{_id: 3, b: {c: 1}}]}
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];
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testPipeline(pipeline, expectedResults, coll);
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// With an $unwind stage.
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coll.drop();
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assert.writeOK(coll.insert({_id: 0, a: {b: 1}}));
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assert.writeOK(coll.insert({_id: 1}));
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from.drop();
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assert.writeOK(from.insert({_id: 0, target: 1}));
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pipeline = [{
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$lookup: {
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localField: "a.b",
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foreignField: "target",
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from: "from",
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as: "same.documents",
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}
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}, {
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// Expected input to $unwind:
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// {_id: 0, a: {b: 1}, same: {documents: [{_id: 0, target: 1}]}}
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// {_id: 1, same: {documents: []}}
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$unwind: {
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path: "$same.documents",
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preserveNullAndEmptyArrays: true,
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includeArrayIndex: "c.d.e",
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}
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}];
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expectedResults = [
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{_id: 0, a: {b: 1}, same: {documents: {_id: 0, target: 1}}, c: {d: {e: NumberLong(0)}}},
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{_id: 1, same: {}, c: {d: {e: null}}},
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];
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testPipeline(pipeline, expectedResults, coll);
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//
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// Query-like local fields (SERVER-21287)
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//
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// This must only do an equality match rather than treating the value as a regex.
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coll.drop();
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assert.writeOK(coll.insert({_id: 0, a: /a regex/}));
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from.drop();
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assert.writeOK(from.insert({_id: 0, b: /a regex/}));
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assert.writeOK(from.insert({_id: 1, b: "string that matches /a regex/"}));
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pipeline = [
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{$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "b",
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}},
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];
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expectedResults = [
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{_id: 0, a: /a regex/, b: [{_id: 0, b: /a regex/}]}
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];
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testPipeline(pipeline, expectedResults, coll);
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//
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// Error cases.
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//
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// All four fields must be specified.
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assertErrorCode(coll, [{$lookup: {foreignField:"b", from:"from", as:"same"}}], 4572);
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assertErrorCode(coll, [{$lookup: {localField:"a", from:"from", as:"same"}}], 4572);
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assertErrorCode(coll, [{$lookup: {localField:"a", foreignField:"b", as:"same"}}], 4572);
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assertErrorCode(coll, [{$lookup: {localField:"a", foreignField:"b", from:"from"}}], 4572);
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// All four field's values must be strings.
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assertErrorCode(coll, [{$lookup: {localField:1, foreignField:"b", from:"from", as:"as"}}]
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, 4570);
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assertErrorCode(coll, [{$lookup: {localField:"a", foreignField:1, from:"from", as:"as"}}]
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, 4570);
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assertErrorCode(coll, [{$lookup: {localField:"a", foreignField:"b", from:1, as:"as"}}]
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, 4570);
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assertErrorCode(coll, [{$lookup: {localField:"a", foreignField: "b", from:"from", as:1}}]
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, 4570);
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// $lookup's field must be an object.
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assertErrorCode(coll, [{$lookup: "string"}], 4569);
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}
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// Run tests on single node.
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db.lookUp.drop();
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db.from.drop();
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runTest(db.lookUp, db.from);
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// Run tests in a sharded environment.
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var sharded = new ShardingTest({shards: 2, mongos: 1});
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assert(sharded.adminCommand({enableSharding : "test"}));
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sharded.getDB('test').lookUp.drop();
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sharded.getDB('test').from.drop();
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assert(sharded.adminCommand({shardCollection: "test.lookUp", key: {_id: 'hashed'}}));
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runTest(sharded.getDB('test').lookUp, sharded.getDB('test').from);
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// An error is thrown if the from collection is sharded.
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assert(sharded.adminCommand({ shardCollection:"test.from", key: {_id: 1}}));
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assertErrorCode(sharded.getDB('test').lookUp, [{
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$lookup: {
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localField: "a",
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foreignField: "b",
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from: "from",
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as: "same"
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}
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}], 28769);
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sharded.stop();
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}());
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