mirror of https://gitee.com/bigwinds/arangodb
427 lines
16 KiB
C++
427 lines
16 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 Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#include "PrimaryIndex.h"
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#include "Aql/AstNode.h"
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#include "Basics/Exceptions.h"
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#include "Basics/hashes.h"
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#include "Indexes/SimpleAttributeEqualityMatcher.h"
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#include "VocBase/document-collection.h"
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#include "VocBase/transaction.h"
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using namespace arangodb;
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static inline uint64_t HashKey(void* userData, char const* key) {
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return TRI_FnvHashString(key);
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}
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static inline uint64_t HashElement(void* userData,
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TRI_doc_mptr_t const* element) {
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return element->_hash;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief determines if a key corresponds to an element
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////////////////////////////////////////////////////////////////////////////////
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static bool IsEqualKeyElement(void* userData, char const* key,
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uint64_t const hash,
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TRI_doc_mptr_t const* element) {
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return (hash == element->_hash &&
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strcmp(key, TRI_EXTRACT_MARKER_KEY(element)) == 0);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief determines if two elements are equal
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////////////////////////////////////////////////////////////////////////////////
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static bool IsEqualElementElement(void* userData, TRI_doc_mptr_t const* left,
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TRI_doc_mptr_t const* right) {
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return left->_hash == right->_hash &&
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strcmp(TRI_EXTRACT_MARKER_KEY(left), TRI_EXTRACT_MARKER_KEY(right)) ==
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0;
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}
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TRI_doc_mptr_t* PrimaryIndexIterator::next() {
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while (true) {
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if (_position >= _keys.size()) {
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// we're at the end of the lookup values
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return nullptr;
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}
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auto result = _index->lookupKey(_trx, _keys[_position++]);
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if (result != nullptr) {
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// found a result
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return result;
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}
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// found no result. now go to next lookup value in _keys
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}
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}
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void PrimaryIndexIterator::reset() { _position = 0; }
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PrimaryIndex::PrimaryIndex(TRI_document_collection_t* collection)
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: Index(0, collection,
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std::vector<std::vector<arangodb::basics::AttributeName>>(
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{{{TRI_VOC_ATTRIBUTE_KEY, false}}}),
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true, false),
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_primaryIndex(nullptr) {
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uint32_t indexBuckets = 1;
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if (collection != nullptr) {
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// document is a nullptr in the coordinator case
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indexBuckets = collection->_info.indexBuckets();
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}
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_primaryIndex = new TRI_PrimaryIndex_t(
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HashKey, HashElement, IsEqualKeyElement, IsEqualElementElement,
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IsEqualElementElement, indexBuckets,
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[]() -> std::string { return "primary"; });
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create an index stub with a hard-coded selectivity estimate
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/// this is used in the cluster coordinator case
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////////////////////////////////////////////////////////////////////////////////
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PrimaryIndex::PrimaryIndex(VPackSlice const& slice)
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: Index(slice), _primaryIndex(nullptr) {}
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PrimaryIndex::~PrimaryIndex() { delete _primaryIndex; }
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the number of documents from the index
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////////////////////////////////////////////////////////////////////////////////
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size_t PrimaryIndex::size() const { return _primaryIndex->size(); }
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the memory usage of the index
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////////////////////////////////////////////////////////////////////////////////
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size_t PrimaryIndex::memory() const { return _primaryIndex->memoryUsage(); }
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a VelocyPack representation of the index
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////////////////////////////////////////////////////////////////////////////////
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void PrimaryIndex::toVelocyPack(VPackBuilder& builder, bool withFigures) const {
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Index::toVelocyPack(builder, withFigures);
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// hard-coded
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builder.add("unique", VPackValue(true));
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builder.add("sparse", VPackValue(false));
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a VelocyPack representation of the index figures
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////////////////////////////////////////////////////////////////////////////////
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void PrimaryIndex::toVelocyPackFigures(VPackBuilder& builder) const {
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Index::toVelocyPackFigures(builder);
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_primaryIndex->appendToVelocyPack(builder);
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}
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int PrimaryIndex::insert(arangodb::Transaction*, TRI_doc_mptr_t const*, bool) {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
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}
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int PrimaryIndex::remove(arangodb::Transaction*, TRI_doc_mptr_t const*, bool) {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief looks up an element given a key
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::lookupKey(arangodb::Transaction* trx,
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char const* key) const {
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return _primaryIndex->findByKey(trx, key);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief looks up an element given a key
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/// returns the index position into which a key would belong in the second
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/// parameter. also returns the hash value for the object
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::lookupKey(
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arangodb::Transaction* trx, char const* key,
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arangodb::basics::BucketPosition& position, uint64_t& hash) const {
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return _primaryIndex->findByKey(trx, key, position, hash);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief a method to iterate over all elements in the index in
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/// a random order.
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/// Returns nullptr if all documents have been returned.
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/// Convention: step === 0 indicates a new start.
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::lookupRandom(
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arangodb::Transaction* trx,
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arangodb::basics::BucketPosition& initialPosition,
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arangodb::basics::BucketPosition& position, uint64_t& step,
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uint64_t& total) {
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return _primaryIndex->findRandom(trx, initialPosition, position, step, total);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief a method to iterate over all elements in the index in
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/// a sequential order.
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/// Returns nullptr if all documents have been returned.
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/// Convention: position === 0 indicates a new start.
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::lookupSequential(
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arangodb::Transaction* trx, arangodb::basics::BucketPosition& position,
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uint64_t& total) {
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return _primaryIndex->findSequential(trx, position, total);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief a method to iterate over all elements in the index in
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/// reversed sequential order.
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/// Returns nullptr if all documents have been returned.
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/// Convention: position === UINT64_MAX indicates a new start.
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::lookupSequentialReverse(
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arangodb::Transaction* trx, arangodb::basics::BucketPosition& position) {
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return _primaryIndex->findSequentialReverse(trx, position);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds a key/element to the index
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/// returns a status code, and *found will contain a found element (if any)
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////////////////////////////////////////////////////////////////////////////////
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int PrimaryIndex::insertKey(arangodb::Transaction* trx, TRI_doc_mptr_t* header,
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void const** found) {
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*found = nullptr;
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int res = _primaryIndex->insert(trx, header);
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if (res == TRI_ERROR_ARANGO_UNIQUE_CONSTRAINT_VIOLATED) {
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*found = _primaryIndex->find(trx, header);
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}
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return res;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds a key/element to the index
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/// this is a special, optimized version that receives the target slot index
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/// from a previous lookupKey call
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////////////////////////////////////////////////////////////////////////////////
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int PrimaryIndex::insertKey(arangodb::Transaction* trx, TRI_doc_mptr_t* header,
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arangodb::basics::BucketPosition const& position) {
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return _primaryIndex->insertAtPosition(trx, header, position);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief removes an key/element from the index
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////////////////////////////////////////////////////////////////////////////////
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TRI_doc_mptr_t* PrimaryIndex::removeKey(arangodb::Transaction* trx,
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char const* key) {
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return _primaryIndex->removeByKey(trx, key);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief resizes the index
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////////////////////////////////////////////////////////////////////////////////
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int PrimaryIndex::resize(arangodb::Transaction* trx, size_t targetSize) {
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return _primaryIndex->resize(trx, targetSize);
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}
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uint64_t PrimaryIndex::calculateHash(arangodb::Transaction* trx,
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char const* key) {
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return HashKey(trx, key);
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}
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uint64_t PrimaryIndex::calculateHash(arangodb::Transaction* trx,
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char const* key, size_t length) {
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return TRI_FnvHashPointer(static_cast<void const*>(key), length);
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}
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void PrimaryIndex::invokeOnAllElements(
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std::function<void(TRI_doc_mptr_t*)> work) {
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_primaryIndex->invokeOnAllElements(work);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief checks whether the index supports the condition
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////////////////////////////////////////////////////////////////////////////////
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bool PrimaryIndex::supportsFilterCondition(
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arangodb::aql::AstNode const* node,
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arangodb::aql::Variable const* reference, size_t itemsInIndex,
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size_t& estimatedItems, double& estimatedCost) const {
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SimpleAttributeEqualityMatcher matcher(
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{{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_ID, false)},
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{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_KEY, false)}});
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return matcher.matchOne(this, node, reference, itemsInIndex, estimatedItems,
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estimatedCost);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates an IndexIterator for the given Condition
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////////////////////////////////////////////////////////////////////////////////
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IndexIterator* PrimaryIndex::iteratorForCondition(
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arangodb::Transaction* trx, IndexIteratorContext* context,
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arangodb::aql::Ast* ast, arangodb::aql::AstNode const* node,
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arangodb::aql::Variable const* reference, bool reverse) const {
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TRI_ASSERT(node->type == aql::NODE_TYPE_OPERATOR_NARY_AND);
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SimpleAttributeEqualityMatcher matcher(
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{{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_ID, false)},
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{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_KEY, false)}});
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TRI_ASSERT(node->numMembers() == 1);
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auto comp = node->getMember(0);
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// assume a.b == value
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auto attrNode = comp->getMember(0);
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auto valNode = comp->getMember(1);
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if (attrNode->type != aql::NODE_TYPE_ATTRIBUTE_ACCESS) {
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// value == a.b -> flip the two sides
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attrNode = comp->getMember(1);
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valNode = comp->getMember(0);
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}
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TRI_ASSERT(attrNode->type == aql::NODE_TYPE_ATTRIBUTE_ACCESS);
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if (comp->type == aql::NODE_TYPE_OPERATOR_BINARY_EQ) {
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// a.b == value
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return createIterator(
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trx, context, attrNode,
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std::vector<arangodb::aql::AstNode const*>({valNode}));
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} else if (comp->type == aql::NODE_TYPE_OPERATOR_BINARY_IN) {
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// a.b IN values
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if (!valNode->isArray()) {
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return nullptr;
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}
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std::vector<arangodb::aql::AstNode const*> valNodes;
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size_t const n = valNode->numMembers();
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valNodes.reserve(n);
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for (size_t i = 0; i < n; ++i) {
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valNodes.emplace_back(valNode->getMemberUnchecked(i));
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TRI_IF_FAILURE("PrimaryIndex::iteratorValNodes") {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
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}
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}
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return createIterator(trx, context, attrNode, valNodes);
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}
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// operator type unsupported
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return nullptr;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief specializes the condition for use with the index
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////////////////////////////////////////////////////////////////////////////////
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arangodb::aql::AstNode* PrimaryIndex::specializeCondition(
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arangodb::aql::AstNode* node,
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arangodb::aql::Variable const* reference) const {
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SimpleAttributeEqualityMatcher matcher(
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{{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_ID, false)},
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{arangodb::basics::AttributeName(TRI_VOC_ATTRIBUTE_KEY, false)}});
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return matcher.specializeOne(this, node, reference);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the iterator
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////////////////////////////////////////////////////////////////////////////////
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IndexIterator* PrimaryIndex::createIterator(
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arangodb::Transaction* trx, IndexIteratorContext* context,
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arangodb::aql::AstNode const* attrNode,
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std::vector<arangodb::aql::AstNode const*> const& valNodes) const {
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// _key or _id?
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bool const isId =
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(strcmp(attrNode->getStringValue(), TRI_VOC_ATTRIBUTE_ID) == 0);
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// only leave the valid elements in the vector
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size_t const n = valNodes.size();
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std::vector<char const*> keys;
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keys.reserve(n);
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for (size_t i = 0; i < n; ++i) {
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auto valNode = valNodes[i];
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if (!valNode->isStringValue()) {
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continue;
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}
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if (valNode->getStringLength() == 0) {
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continue;
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}
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if (isId) {
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// lookup by _id. now validate if the lookup is performed for the
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// correct collection (i.e. _collection)
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TRI_voc_cid_t cid;
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char const* key;
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int res = context->resolveId(valNode->getStringValue(), cid, key);
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if (res != TRI_ERROR_NO_ERROR) {
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continue;
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}
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TRI_ASSERT(cid != 0);
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TRI_ASSERT(key != nullptr);
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if (!context->isCluster() && cid != _collection->_info.id()) {
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// only continue lookup if the id value is syntactically correct and
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// refers to "our" collection, using local collection id
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continue;
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}
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if (context->isCluster() && cid != _collection->_info.planId()) {
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// only continue lookup if the id value is syntactically correct and
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// refers to "our" collection, using cluster collection id
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continue;
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}
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// use _key value from _id
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keys.push_back(key);
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} else {
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keys.emplace_back(valNode->getStringValue());
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}
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}
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TRI_IF_FAILURE("PrimaryIndex::noIterator") {
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THROW_ARANGO_EXCEPTION(TRI_ERROR_DEBUG);
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}
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return new PrimaryIndexIterator(trx, this, keys);
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}
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