mirror of https://gitee.com/bigwinds/arangodb
238 lines
6.6 KiB
C++
238 lines
6.6 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2017 ArangoDB 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 Daniel H. Larkin
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/// @author Andrey Abramov
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/// @author Vasiliy Nabatchikov
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_IRESEARCH__IRESEARCH_VIEW_BLOCK_H
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#define ARANGOD_IRESEARCH__IRESEARCH_VIEW_BLOCK_H 1
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include "Aql/ExpressionContext.h"
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#include "VocBase/LogicalView.h"
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#include "VocBase/ManagedDocumentResult.h"
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#include "utils/attributes.hpp"
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#include "IResearch/ExpressionFilter.h"
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#include "IResearch/IResearchView.h"
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NS_BEGIN(iresearch)
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class score;
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NS_END // iresearch
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NS_BEGIN(arangodb)
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NS_BEGIN(aql)
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class AqlItemBlock;
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class ExecutionEngine;
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NS_END // aql
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NS_BEGIN(iresearch)
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class IResearchViewNode;
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///////////////////////////////////////////////////////////////////////////////
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/// @class ViewExpressionContext
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///////////////////////////////////////////////////////////////////////////////
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class ViewExpressionContext final : public aql::ExpressionContext {
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public:
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explicit ViewExpressionContext(IResearchViewNode const& node)
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: _node(&node) {
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TRI_ASSERT(_node);
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}
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virtual size_t numRegisters() const override;
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virtual aql::AqlValue const& getRegisterValue(size_t i) const override {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
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}
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virtual aql::Variable const* getVariable(size_t i) const override {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
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}
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virtual aql::AqlValue getVariableValue(
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aql::Variable const* variable,
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bool doCopy,
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bool& mustDestroy
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) const override;
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aql::AqlItemBlock const* _data{};
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IResearchViewNode const* _node;
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size_t _pos{};
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}; // ViewExpressionContext
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///////////////////////////////////////////////////////////////////////////////
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/// @class IResearchViewBlockBase
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///////////////////////////////////////////////////////////////////////////////
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class IResearchViewBlockBase : public aql::ExecutionBlock {
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public:
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IResearchViewBlockBase(
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arangodb::iresearch::PrimaryKeyIndexReader const& reader,
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aql::ExecutionEngine&,
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IResearchViewNode const&
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);
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std::pair<aql::ExecutionState, std::unique_ptr<aql::AqlItemBlock>> getSome(size_t atMost) override final;
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// skip between atLeast and atMost returns the number actually skipped . . .
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std::pair<aql::ExecutionState, size_t> skipSome(size_t atMost) override final;
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// here we release our docs from this collection
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virtual std::pair<aql::ExecutionState, Result> initializeCursor(aql::AqlItemBlock* items, size_t pos) override;
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protected:
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bool readDocument(size_t segmentId, irs::doc_id_t docId);
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virtual void reset();
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virtual bool next(
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aql::AqlItemBlock& res,
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aql::RegisterId curReg,
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size_t& pos,
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size_t limit
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) = 0;
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virtual size_t skip(size_t count) = 0;
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irs::attribute_view _filterCtx; // filter context
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ViewExpressionContext _ctx;
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iresearch::PrimaryKeyIndexReader const& _reader;
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irs::filter::prepared::ptr _filter;
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irs::order::prepared _order;
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iresearch::ExpressionExecutionContext _execCtx; // expression execution context
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ManagedDocumentResult _mmdr;
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bool _hasMore;
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bool _volatileSort;
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bool _volatileFilter;
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/// @brief The number of documents inflight if we hit a WAITING state.
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size_t _inflight;
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}; // IResearchViewBlockBase
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///////////////////////////////////////////////////////////////////////////////
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/// @class IResearchViewUnorderedBlock
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///////////////////////////////////////////////////////////////////////////////
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class IResearchViewUnorderedBlock : public IResearchViewBlockBase {
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public:
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IResearchViewUnorderedBlock(
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PrimaryKeyIndexReader const& reader,
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aql::ExecutionEngine& engine,
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IResearchViewNode const& node
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);
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Type getType() const override {
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return Type::IRESEARCH_VIEW_UNORDERED;
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}
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protected:
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virtual void reset() override final {
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IResearchViewBlockBase::reset();
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// reset iterator state
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_itr.reset();
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_readerOffset = 0;
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}
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virtual bool next(
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aql::AqlItemBlock& res,
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aql::RegisterId curReg,
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size_t& pos,
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size_t limit
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) override;
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virtual size_t skip(size_t count) override;
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irs::doc_iterator::ptr _itr;
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size_t _readerOffset;
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}; // IResearchViewUnorderedBlock
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///////////////////////////////////////////////////////////////////////////////
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/// @class IResearchViewBlock
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///////////////////////////////////////////////////////////////////////////////
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class IResearchViewBlock final : public IResearchViewUnorderedBlock {
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public:
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IResearchViewBlock(
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PrimaryKeyIndexReader const& reader,
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aql::ExecutionEngine& engine,
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IResearchViewNode const& node
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);
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Type getType() const override final {
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return Type::IRESEARCH_VIEW;
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}
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protected:
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virtual bool next(
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aql::AqlItemBlock& res,
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aql::RegisterId curReg,
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size_t& pos,
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size_t limit
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) override;
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virtual size_t skip(size_t count) override;
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private:
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void resetIterator();
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irs::score const* _scr;
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irs::bytes_ref _scrVal;
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}; // IResearchViewBlock
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///////////////////////////////////////////////////////////////////////////////
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/// @class IResearchViewOrderedBlock
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///////////////////////////////////////////////////////////////////////////////
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class IResearchViewOrderedBlock final : public IResearchViewBlockBase {
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public:
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IResearchViewOrderedBlock(
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PrimaryKeyIndexReader const& reader,
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aql::ExecutionEngine& engine,
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IResearchViewNode const& node
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);
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Type getType() const override final {
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return Type::IRESEARCH_VIEW_ORDERED;
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}
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protected:
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virtual void reset() override {
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IResearchViewBlockBase::reset();
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_skip = 0;
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}
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virtual bool next(
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aql::AqlItemBlock& res,
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aql::RegisterId curReg,
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size_t& pos,
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size_t limit
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) override;
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virtual size_t skip(size_t count) override;
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private:
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size_t _skip{};
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}; // IResearchViewOrderedBlock
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NS_END // iresearch
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NS_END // arangodb
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#endif // ARANGOD_IRESEARCH__ENUMERATE_VIEW_BLOCK_H
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