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// Tests that an aggregation with a $sort near the front of the pipeline can sometimes use the query
// system to provide the sort.
//
// Relies on the ability to push leading $sorts down to the query system, so cannot wrap pipelines
// in $facet stages:
// @tags: [do_not_wrap_aggregations_in_facets]
(function() {
"use strict";
load("jstests/libs/analyze_plan.js"); // For 'aggPlanHasStage' and other explain helpers.
const coll = db.use_query_sort;
coll.drop();
const bulk = coll.initializeUnorderedBulkOp();
for (let i = 0; i < 100; ++i) {
bulk.insert({_id: i, x: "string", a: -i, y: i % 2});
}
assert.writeOK(bulk.execute());
function assertHasNonBlockingQuerySort(pipeline) {
const explainOutput = coll.explain().aggregate(pipeline);
assert(isQueryPlan(explainOutput));
assert(!planHasStage(db, explainOutput, "SORT"),
"Expected pipeline " + tojsononeline(pipeline) +
" *not* to include a SORT stage in the explain output: " +
tojson(explainOutput));
assert(planHasStage(db, explainOutput, "IXSCAN"),
"Expected pipeline " + tojsononeline(pipeline) +
" to include an index scan in the explain output: " + tojson(explainOutput));
assert(!hasRejectedPlans(explainOutput),
"Expected pipeline " + tojsononeline(pipeline) +
" not to have any rejected plans in the explain output: " +
tojson(explainOutput));
return explainOutput;
}
function assertDoesNotHaveQuerySort(pipeline) {
const explainOutput = coll.explain().aggregate(pipeline);
assert(isAggregationPlan(explainOutput));
assert(aggPlanHasStage(explainOutput, "$sort"),
"Expected pipeline " + tojsononeline(pipeline) +
" to include a $sort stage in the explain output: " + tojson(explainOutput));
assert(!aggPlanHasStage(explainOutput, "SORT"),
"Expected pipeline " + tojsononeline(pipeline) +
" *not* to include a SORT stage in the explain output: " +
tojson(explainOutput));
assert(!hasRejectedPlans(explainOutput),
"Expected pipeline " + tojsononeline(pipeline) +
" not to have any rejected plans in the explain output: " +
tojson(explainOutput));
return explainOutput;
}
// Test that a sort on the _id can use the query system to provide the sort.
assertHasNonBlockingQuerySort([{$sort: {_id: -1}}]);
assertHasNonBlockingQuerySort([{$sort: {_id: 1}}]);
assertHasNonBlockingQuerySort([{$match: {_id: {$gte: 50}}}, {$sort: {_id: 1}}]);
assertHasNonBlockingQuerySort([{$match: {_id: {$gte: 50}}}, {$sort: {_id: -1}}]);
// Test that a sort on a field not in any index cannot use a query system sort, and thus still
// has a $sort stage.
assertDoesNotHaveQuerySort([{$sort: {x: -1}}]);
assertDoesNotHaveQuerySort([{$sort: {x: 1}}]);
assertDoesNotHaveQuerySort([{$match: {_id: {$gte: 50}}}, {$sort: {x: 1}}]);
assert.commandWorked(coll.createIndex({x: 1, y: -1}));
assertHasNonBlockingQuerySort([{$sort: {x: 1, y: -1}}]);
assertHasNonBlockingQuerySort([{$sort: {x: 1}}]);
assertDoesNotHaveQuerySort([{$sort: {y: 1}}]);
assertDoesNotHaveQuerySort([{$sort: {x: 1, y: 1}}]);
// Test that a $match on a field not present in the same index eligible to provide a sort can
// still result in a index scan on the sort field (SERVER-7568).
assertHasNonBlockingQuerySort([{$match: {_id: {$gte: 50}}}, {$sort: {x: 1}}]);
// Test that a sort on the text score does not use the query system to provide the sort, since
// it would need to be a blocking sort, and we prefer the $sort stage to the query system's sort
// implementation.
assert.commandWorked(coll.createIndex({x: "text"}));
assertDoesNotHaveQuerySort(
[{$match: {$text: {$search: "test"}}}, {$sort: {key: {$meta: "textScore"}}}]);
}());
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