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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/optimizer/metadata_factory.h"
#include "mongo/db/query/optimizer/rewrites/const_eval.h"
#include "mongo/db/query/optimizer/utils/utils.h"
namespace mongo::optimizer {
MultikeynessTrie createTrie(const IndexDefinitions& indexDefs) {
MultikeynessTrie multikeynessTrie;
// Collect non-multiKeyPaths from each index.
for (const auto& [indexDefName, indexDef] : indexDefs) {
// Skip partial indexes. A path could be non-multikey on a partial index (subset of the
// collection), but still be multikey on the overall collection.
if (!indexDef.getPartialReqMap().isNoop()) {
continue;
}
for (const auto& component : indexDef.getCollationSpec()) {
multikeynessTrie.add(component._path.ref());
}
}
// The empty path refers to the whole document, which can't be an array.
multikeynessTrie.isMultiKey = false;
return multikeynessTrie;
}
ScanDefinition createScanDef(ScanDefOptions options, IndexDefinitions indexDefs) {
MultikeynessTrie multikeynessTrie = createTrie(indexDefs);
return createScanDef(std::move(options),
std::move(indexDefs),
std::move(multikeynessTrie),
ConstEval::constFold,
{DistributionType::Centralized},
true);
}
ScanDefinition createScanDef(ScanDefOptions options,
IndexDefinitions indexDefs,
const ConstFoldFn& constFold,
DistributionAndPaths distributionAndPaths,
const bool exists,
boost::optional<CEType> ce) {
MultikeynessTrie multikeynessTrie = createTrie(indexDefs);
return createScanDef(std::move(options),
std::move(indexDefs),
std::move(multikeynessTrie),
constFold,
std::move(distributionAndPaths),
exists,
std::move(ce));
}
ScanDefinition createScanDef(ScanDefOptions options,
IndexDefinitions indexDefs,
MultikeynessTrie multikeynessTrie,
const ConstFoldFn& constFold,
DistributionAndPaths distributionAndPaths,
const bool exists,
boost::optional<CEType> ce) {
// Simplify partial filter requirements using the non-multikey paths.
for (auto& [indexDefName, indexDef] : indexDefs) {
ProjectionRenames projRenames_unused;
[[maybe_unused]] const bool hasEmptyInterval =
simplifyPartialSchemaReqPaths(boost::none /*scanProjName*/,
multikeynessTrie,
indexDef.getPartialReqMap(),
projRenames_unused,
constFold);
tassert(6624157,
"We should not be seeing renames from partial index filters",
projRenames_unused.empty());
// If "hasEmptyInterval" is set, we have a partial filter index with an unsatisfiable
// condition, which is thus guaranteed to never contain any documents.
}
return {std::move(options),
std::move(indexDefs),
std::move(multikeynessTrie),
std::move(distributionAndPaths),
exists,
std::move(ce)};
}
} // namespace mongo::optimizer
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