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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/json.h"
#include "mongo/db/pipeline/document_source_group.h"
#include "mongo/db/pipeline/document_source_mock.h"
#include "mongo/db/pipeline/inner_pipeline_stage_impl.h"
#include "mongo/db/pipeline/inner_pipeline_stage_interface.h"
#include "mongo/db/query/query_planner_test_fixture.h"
namespace {
using namespace mongo;
class QueryPlannerGroupPushdownTest : public QueryPlannerTest {
protected:
/**
* Makes a vector of InnerPipelineStageInterface that carries the input DocumentSources.
*/
std::vector<std::unique_ptr<InnerPipelineStageInterface>> makeInnerPipelineStages(
const Pipeline& pipeline) {
std::vector<std::unique_ptr<InnerPipelineStageInterface>> stages;
for (auto&& source : pipeline.getSources()) {
stages.emplace_back(std::make_unique<InnerPipelineStageImpl>(source));
}
return stages;
}
/*
* Builds a pipeline from raw input.
*/
std::unique_ptr<Pipeline, PipelineDeleter> buildTestPipeline(
const std::vector<BSONObj>& rawPipeline) {
return Pipeline::parse(rawPipeline, expCtx);
}
};
TEST_F(QueryPlannerGroupPushdownTest, PushdownOfASingleGroup) {
const std::vector<BSONObj> rawPipeline = {
fromjson("{$group: {_id: '$_id', count: {$sum: '$x'}}}"),
};
auto pipeline = buildTestPipeline(rawPipeline);
runQueryWithPipeline(fromjson("{x: 1}"), makeInnerPipelineStages(*pipeline.get()));
ASSERT_EQUALS(getNumSolutions(), 1U);
assertPostMultiPlanSolutionMatches(
"{group: {key: {_id: '$_id'}, accs: [{count: {$sum: '$x'}}], node: {sentinel: "
"{}}}}");
}
TEST_F(QueryPlannerGroupPushdownTest, PushdownOfTwoGroups) {
const std::vector<BSONObj> rawPipeline = {
fromjson("{$group: {_id: '$_id', count: {$sum: '$x'}}}"),
fromjson("{$group: {_id: '$_id', count: {$min: '$count'}}}"),
};
auto pipeline = buildTestPipeline(rawPipeline);
runQueryWithPipeline(fromjson("{x: 1}"), makeInnerPipelineStages(*pipeline.get()));
ASSERT_EQUALS(getNumSolutions(), 1U);
assertPostMultiPlanSolutionMatches(
"{group: {key: {_id: '$_id'}, accs: [{count: {$min: '$count'}}], node: {group: "
"{key: {_id: "
"'$_id'}, accs: [{count: {$sum: '$x'}}], node: {sentinel: {}}}}}}");
}
TEST_F(QueryPlannerGroupPushdownTest, PushdownOfOneGroupWithMultipleAccumulators) {
const std::vector<BSONObj> rawPipeline = {
fromjson("{$group: {_id: '$_id', count: {$sum: '$x'}, m: {$min: '$y'}}}"),
};
auto pipeline = buildTestPipeline(rawPipeline);
runQueryWithPipeline(fromjson("{x: 1}"), makeInnerPipelineStages(*pipeline.get()));
ASSERT_EQUALS(getNumSolutions(), 1U);
assertPostMultiPlanSolutionMatches(
"{group: {key: {_id: '$_id'}, accs: [{count: {$sum: '$x'}}, {m: {$min: '$y'}}], node: "
"{sentinel: "
"{}}}}");
}
} // namespace
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