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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/db/query/ce/scalar_histogram.h"
#include "mongo/db/exec/sbe/values/bson.h"
#include "mongo/db/exec/sbe/values/value.h"
namespace mongo::ce {
using namespace sbe;
Bucket::Bucket(
double equalFreq, double rangeFreq, double cumulativeFreq, double ndv, double cumulativeNDV)
: _equalFreq(equalFreq),
_rangeFreq(rangeFreq),
_cumulativeFreq(cumulativeFreq),
_ndv(ndv),
_cumulativeNDV(cumulativeNDV) {
uassert(6695702, "Invalid equalFreq", _equalFreq >= 0.0);
uassert(6695703, "Invalid rangeFreq", _rangeFreq >= 0.0);
uassert(6695704, "Invalid ndv", _ndv <= _rangeFreq);
uassert(6695705, "Invalid cumulative frequency", _cumulativeFreq >= _equalFreq + _rangeFreq);
uassert(6695706, "Invalid cumulative ndv", _cumulativeNDV >= _ndv + 1.0);
}
std::string Bucket::toString() const {
std::ostringstream os;
os << "equalFreq: " << _equalFreq << ", rangeFreq: " << _rangeFreq
<< ", cumulativeFreq: " << _cumulativeFreq << ", ndv: " << _ndv
<< ", cumulativeNDV: " << _cumulativeNDV;
return os.str();
}
ScalarHistogram::ScalarHistogram() : ScalarHistogram({}, {}) {}
ScalarHistogram::ScalarHistogram(const Histogram& histogram) {
for (const auto& bucket : histogram.getBuckets()) {
Bucket b(bucket.getBoundaryCount(),
bucket.getRangeCount(),
bucket.getCumulativeCount(),
bucket.getRangeDistincts(),
bucket.getCumulativeDistincts());
_buckets.push_back(std::move(b));
}
for (const auto& bound : histogram.getBounds()) {
auto value = sbe::bson::convertFrom<1>(bound.getElement());
_bounds.push_back(value.first, value.second);
}
}
ScalarHistogram::ScalarHistogram(value::Array bounds, std::vector<Bucket> buckets)
: _bounds(std::move(bounds)), _buckets(std::move(buckets)) {
uassert(6695707, "Invalid sizes", bounds.size() == buckets.size());
}
std::string ScalarHistogram::toString() const {
std::ostringstream os;
os << "[";
for (size_t i = 0; i < _buckets.size(); i++) {
os << "{val: " << _bounds.getAt(i) << ", " << _buckets.at(i).toString() << "}";
if (_buckets.size() - i > 1)
os << ",";
}
os << "]";
return os.str();
}
std::string ScalarHistogram::plot() const {
std::ostringstream os;
double maxFreq = 0;
const double maxBucketSize = 100;
for (const auto& bucket : _buckets) {
double maxBucketFreq = std::max(bucket._equalFreq, bucket._rangeFreq);
maxFreq = std::max(maxFreq, maxBucketFreq);
}
std::vector<std::pair<double, std::string>> headers;
size_t maxHeaderSize = 0;
for (size_t i = 0; i < _buckets.size(); ++i) {
std::ostringstream rngHeader;
std::ostringstream eqlHeader;
double scaledRngF = maxBucketSize * _buckets[i]._rangeFreq / maxFreq;
double scaledEqlF = maxBucketSize * _buckets[i]._equalFreq / maxFreq;
rngHeader << _bounds.getAt(i) << ": " << _buckets[i]._rangeFreq;
eqlHeader << _bounds.getAt(i) << ": " << _buckets[i]._equalFreq;
auto rngStr = rngHeader.str();
maxHeaderSize = std::max(maxHeaderSize, rngStr.size());
headers.emplace_back(scaledRngF, rngStr);
auto eqlStr = eqlHeader.str();
maxHeaderSize = std::max(maxHeaderSize, eqlStr.size());
headers.emplace_back(scaledEqlF, eqlStr);
}
const std::string maxLine(maxBucketSize + maxHeaderSize + 3, '-');
os << maxLine << "\n";
for (size_t j = 0; j < headers.size(); ++j) {
auto header = headers.at(j);
header.second.resize(maxHeaderSize, ' ');
const std::string bar(std::round(header.first), '*');
os << header.second << " | " << bar << "\n";
}
os << maxLine << "\n";
return os.str();
}
const value::Array& ScalarHistogram::getBounds() const {
return _bounds;
}
const std::vector<Bucket>& ScalarHistogram::getBuckets() const {
return _buckets;
}
} // namespace mongo::ce
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