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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/pipeline/abt/collation_translation.h"
#include "mongo/db/pipeline/abt/utils.h"
namespace mongo::optimizer {
void generateCollationNode(AlgebrizerContext& ctx, const SortPattern& sortPattern) {
ProjectionCollationSpec collationSpec;
auto rootProjection = ctx.getNode()._rootProjection;
// Create Evaluation node for each sort field.
for (const auto& part : sortPattern) {
if (!part.fieldPath.has_value()) {
continue;
}
const auto& sortProjName = ctx.getNextId("sort");
collationSpec.emplace_back(
sortProjName, part.isAscending ? CollationOp::Ascending : CollationOp::Descending);
ABT sortPath = translateFieldPath(
*part.fieldPath,
make<PathIdentity>(),
[](FieldNameType fieldName, const bool /*isLastElement*/, ABT input) {
return make<PathGet>(std::move(fieldName), std::move(input));
});
ctx.setNode<EvaluationNode>(
rootProjection,
std::move(sortProjName),
make<EvalPath>(std::move(sortPath), make<Variable>(rootProjection)),
std::move(ctx.getNode()._node));
}
if (collationSpec.empty()) {
return;
}
ctx.setNode<CollationNode>(std::move(rootProjection),
properties::CollationRequirement(std::move(collationSpec)),
std::move(ctx.getNode()._node));
}
} // namespace mongo::optimizer
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