mirror of https://gitee.com/bigwinds/arangodb
254 lines
9.3 KiB
C++
254 lines
9.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief AQL IndexBlock
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2010-2014 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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/// @author Michael Hackstein
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/// @author Copyright 2015, ArangoDB GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_AQL_INDEX_BLOCK_H
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#define ARANGODB_AQL_INDEX_BLOCK_H 1
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#include "Aql/Collection.h"
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include "Aql/IndexNode.h"
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#include "Utils/AqlTransaction.h"
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#include "VocBase/shaped-json.h"
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struct TRI_doc_mptr_copy_t;
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struct TRI_edge_index_iterator_t;
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struct TRI_hash_index_element_multi_s;
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namespace triagens {
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namespace arango {
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struct IndexIteratorContext;
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}
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namespace aql {
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class AqlItemBlock;
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class ExecutionEngine;
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// -----------------------------------------------------------------------------
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// --SECTION-- NodePath
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief struct to hold the member-indexes in the _condition node
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////////////////////////////////////////////////////////////////////////////////
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struct NonConstExpression {
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size_t const orMember;
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size_t const andMember;
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size_t const operatorMember;
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Expression* expression;
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NonConstExpression (
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size_t const orM,
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size_t const andM,
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size_t const opM,
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Expression* exp)
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: orMember(orM),
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andMember(andM),
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operatorMember(opM),
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expression(exp) {
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}
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~NonConstExpression () {
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delete expression;
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}
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- IndexRangeBlock
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// -----------------------------------------------------------------------------
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class IndexBlock : public ExecutionBlock {
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public:
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IndexBlock (ExecutionEngine* engine,
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IndexNode const* ep);
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~IndexBlock ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialize, here we fetch all docs from the database
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////////////////////////////////////////////////////////////////////////////////
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int initialize () override;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initializeCursor, here we release our docs from this collection
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////////////////////////////////////////////////////////////////////////////////
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int initializeCursor (AqlItemBlock* items, size_t pos) override;
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AqlItemBlock* getSome (size_t atLeast, size_t atMost) override final;
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////////////////////////////////////////////////////////////////////////////////
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// skip between atLeast and atMost, returns the number actually skipped . . .
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// will only return less than atLeast if there aren't atLeast many
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// things to skip overall.
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////////////////////////////////////////////////////////////////////////////////
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size_t skipSome (size_t atLeast, size_t atMost) override final;
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Forwards _iterator to the next available index
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////////////////////////////////////////////////////////////////////////////////
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void startNextIterator ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Initializes the indexes
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////////////////////////////////////////////////////////////////////////////////
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bool initIndexes ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not one of the bounds expressions requires V8
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////////////////////////////////////////////////////////////////////////////////
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bool hasV8Expression () const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief build the bounds expressions
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////////////////////////////////////////////////////////////////////////////////
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void buildExpressions ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief continue fetching of documents
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////////////////////////////////////////////////////////////////////////////////
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bool readIndex (size_t atMost);
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief collection
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////////////////////////////////////////////////////////////////////////////////
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Collection const* _collection;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief document buffer
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////////////////////////////////////////////////////////////////////////////////
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std::vector<TRI_doc_mptr_copy_t> _documents;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current position in _allDocs
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////////////////////////////////////////////////////////////////////////////////
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size_t _posInDocs;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief current position in _indexes
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////////////////////////////////////////////////////////////////////////////////
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size_t _currentIndex;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _indexes holds all Indexes used in this block
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////////////////////////////////////////////////////////////////////////////////
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std::vector<Index const*> _indexes;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _nonConstExpressions, list of all non const expressions, mapped
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/// by their _condition node path indexes
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////////////////////////////////////////////////////////////////////////////////
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std::vector<NonConstExpression> _nonConstExpressions;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _inVars, a vector containing for each expression above
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/// a vector of Variable*, used to execute the expression
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/////////////////////////////////////////////////////////////////////////////////
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std::vector<std::vector<Variable const*>> _inVars;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _inRegs, a vector containing for each expression above
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/// a vector of RegisterId, used to execute the expression
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////////////////////////////////////////////////////////////////////////////////
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std::vector<std::vector<RegisterId>> _inRegs;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief context for index iteration
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////////////////////////////////////////////////////////////////////////////////
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triagens::arango::IndexIteratorContext* _context;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _iterator: holds the index iterator found using
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/// getIndexIterator (if any) so that it can be read in chunks and not
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/// necessarily all at once.
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////////////////////////////////////////////////////////////////////////////////
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triagens::arango::IndexIterator* _iterator;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief _condition: holds the complete condition this Block can serve for
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////////////////////////////////////////////////////////////////////////////////
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AstNode const* _condition;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief set of already returned documents. Used to make the result distinct.
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_set<TRI_doc_mptr_t*> _alreadyReturned;
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size_t _posInRanges;
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bool _hasV8Expression;
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};
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} // namespace triagens::aql
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} // namespace triagens
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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