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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "predicate_tree_annotator.h"
#include <vespa/searchlib/memoryindex/word_store.h>
#include <vespa/vespalib/btree/btree.h>
#include <vespa/vespalib/data/databuffer.h>
#include <vespa/vespalib/stllike/hash_map.h>
#include <unordered_set>
namespace search::predicate {
/**
* Class used to track the {featureId, docId} pairs that are inserted
* into the btree memory index dictionary. These pairs are later used
* when removing all remains of a document from the feature posting
* lists of the dictionary.
*/
class DocumentFeaturesStore {
using WordStore = memoryindex::WordStore;
struct Range {
vespalib::datastore::EntryRef label_ref;
int64_t from;
int64_t to;
};
// Compares EntryRefs by their corresponding word in a WordStore.
// To find a word without knowing its EntryRef, set the word in
// the constructor and search for an illegal EntryRef.
class KeyComp {
const WordStore &_word_store;
const vespalib::string _word;
const char *getWord(vespalib::datastore::EntryRef ref) const {
return ref.valid() ? _word_store.getWord(ref) : _word.c_str();
}
public:
KeyComp(const WordStore &word_store, vespalib::stringref word)
: _word_store(word_store),
_word(word) {
}
bool operator()(const vespalib::datastore::EntryRef &lhs,
const vespalib::datastore::EntryRef &rhs) const {
return strcmp(getWord(lhs), getWord(rhs)) < 0;
}
};
using FeatureVector = vespalib::Array<uint64_t>;
using DocumentFeaturesMap = vespalib::hash_map<uint32_t, FeatureVector>;
using RangeVector = vespalib::Array<Range>;
using RangeFeaturesMap = vespalib::hash_map<uint32_t, RangeVector>;
using WordIndex = vespalib::btree::BTree<vespalib::datastore::EntryRef, vespalib::btree::BTreeNoLeafData,
vespalib::btree::NoAggregated, const KeyComp &>;
DocumentFeaturesMap _docs;
RangeFeaturesMap _ranges;
WordStore _word_store;
WordIndex _word_index;
size_t _numFeatures;
size_t _numRanges;
uint32_t _arity;
public:
using FeatureSet = std::unordered_set<uint64_t>;
DocumentFeaturesStore(uint32_t arity);
DocumentFeaturesStore(vespalib::DataBuffer &buffer);
~DocumentFeaturesStore();
void insert(const PredicateTreeAnnotations &annotations, uint32_t docId);
FeatureSet get(uint32_t docId) const;
void remove(uint32_t docId);
vespalib::MemoryUsage getMemoryUsage() const;
void serialize(vespalib::DataBuffer &buffer) const;
};
}
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