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/**
* Copyright (C) 2022-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/bson/bsonobjbuilder.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/exec/docval_to_sbeval.h"
#include "mongo/db/pipeline/accumulation_statement.h"
#include "mongo/db/pipeline/accumulator.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/query/allowed_contexts.h"
#include "mongo/db/query/stats/max_diff.h"
#include "mongo/db/query/stats/stats_gen.h"
#include "mongo/db/query/stats/value_utils.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo {
using boost::intrusive_ptr;
AccumulationExpression parseInternalConstructStats(ExpressionContext* const expCtx,
BSONElement elem,
VariablesParseState vps) {
expCtx->sbeCompatibility = SbeCompatibility::notCompatible;
IDLParserContext parser("$_internalConstructStats");
tassert(7261401,
"expected $_internalConstructStats in the analyze pipeline to an object",
elem.isABSONObj());
auto params = InternalConstructStatsAccumulatorParams::parse(parser, elem.Obj());
auto initializer = ExpressionConstant::create(expCtx, Value(BSONNULL));
auto argument = Expression::parseOperand(expCtx, elem, vps);
return {
initializer,
argument,
[expCtx, params]() { return AccumulatorInternalConstructStats::create(expCtx, params); },
"_internalConstructStats"};
}
REGISTER_ACCUMULATOR(_internalConstructStats, parseInternalConstructStats);
AccumulatorInternalConstructStats::AccumulatorInternalConstructStats(
ExpressionContext* const expCtx, InternalConstructStatsAccumulatorParams params)
: AccumulatorState(expCtx), _count(0.0), _params(params) {
assertAllowedInternalIfRequired(
expCtx->opCtx, "_internalConstructStats", AllowedWithClientType::kInternal);
_memUsageBytes = sizeof(*this);
}
intrusive_ptr<AccumulatorState> AccumulatorInternalConstructStats::create(
ExpressionContext* const expCtx, InternalConstructStatsAccumulatorParams params) {
return new AccumulatorInternalConstructStats(expCtx, params);
}
void AccumulatorInternalConstructStats::processInternal(const Value& input, bool merging) {
uassert(8423375, "Can not merge analyze pipelines", !merging);
const auto& doc = input.getDocument();
// The $project stage in the analyze pipeline outputs a document of the form:
// {val: "some value from the collection"}
// The $_internalConstructStats accumulator looks like:
// {$_internalConstructStats: {val: "$$ROOT", sampleRate: 0.5, ...}}
// Thus the `input` parameter has the form:
// {val: {_id: ..., val: "some value from the collection"}, sampleRate: 0.5}
auto val = doc["val"][InternalConstructStatsAccumulatorParams::kValFieldName];
LOGV2_DEBUG(6735800, 4, "Extracted document", "val"_attr = val);
_values.emplace_back(stats::SBEValue(sbe::value::makeValue(val)));
_count++;
_memUsageBytes = sizeof(*this);
}
Value AccumulatorInternalConstructStats::getValue(bool toBeMerged) {
uassert(8423374, "Can not merge analyze pipelines", !toBeMerged);
// Generate and serialize maxdiff histogram for scalar and array values.
auto arrayHistogram = stats::createArrayEstimator(_values, _params.getNumberBuckets());
auto stats = stats::makeStatistics(_count, _params.getSampleRate(), arrayHistogram);
return Value(stats);
}
void AccumulatorInternalConstructStats::reset() {
_count = 0.0;
_values.clear();
_memUsageBytes = sizeof(*this);
}
} // namespace mongo
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