mirror of https://gitee.com/bigwinds/arangodb
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_DOCUMENT_PRODUCING_NODE_H
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#define ARANGOD_AQL_DOCUMENT_PRODUCING_NODE_H 1
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#include "Basics/Common.h"
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#include <velocypack/Builder.h>
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#include <velocypack/Slice.h>
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#include <unordered_set>
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namespace arangodb {
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namespace aql {
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class ExecutionPlan;
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struct Variable;
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class DocumentProducingNode {
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public:
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explicit DocumentProducingNode(Variable const* outVariable);
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DocumentProducingNode(ExecutionPlan* plan, arangodb::velocypack::Slice slice);
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virtual ~DocumentProducingNode() = default;
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public:
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/// @brief return the out variable
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Variable const* outVariable() const { return _outVariable; }
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std::vector<std::string> const& projections() const { return _projections; }
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void projections(std::vector<std::string> const& projections) {
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_projections = projections;
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}
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void projections(std::vector<std::string>&& projections) {
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_projections = std::move(projections);
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}
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void projections(std::unordered_set<std::string>&& projections) {
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_projections.clear();
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_projections.reserve(projections.size());
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for (auto& it : projections) {
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_projections.push_back(std::move(it));
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}
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}
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std::vector<size_t> const& coveringIndexAttributePositions() const {
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return _coveringIndexAttributePositions;
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}
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void toVelocyPack(arangodb::velocypack::Builder& builder) const;
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protected:
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Variable const* _outVariable;
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/// @brief produce only the following attributes
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std::vector<std::string> _projections;
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/// @brief vector (built up in order of projection attributes) that contains
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/// the position of the index attribute value in the data returned by the
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/// index example, if the index is on ["a", "b", "c"], and the projections are
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/// ["b", "a"], then this vector will contain [1, 0] the vector will only be
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/// populated by IndexNodes, and will be left empty by
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/// EnumerateCollectionNodes
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std::vector<std::size_t> mutable _coveringIndexAttributePositions;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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