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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "matching_elements_search.h"
#include <vespa/searchcommon/attribute/attributecontent.h>
#include <vespa/searchlib/attribute/integerbase.h>
#include <vespa/searchlib/attribute/stringbase.h>
#include <vespa/searchlib/common/matching_elements.h>
#include <vespa/vespalib/stllike/hash_set.h>
#include <vespa/vespalib/stllike/hash_set.hpp>
#include <vespa/vespalib/util/array_equal.hpp>
using search::attribute::AttributeContent;
using search::attribute::IAttributeVector;
using search::attribute::BasicType;
using vespalib::datastore::EntryRef;
namespace search::queryeval {
MatchingElementsSearch::MatchingElementsSearch()
: _matching_elements()
{
}
MatchingElementsSearch::~MatchingElementsSearch() = default;
inline namespace matchingelements {
int64_t get_from_enum(const IntegerAttributeTemplate<int64_t> &attr, EntryRef enum_idx)
{
return attr.getFromEnum(enum_idx.ref());
}
const char* get_from_enum(const StringAttribute &attr, EntryRef enum_idx)
{
return attr.getFromEnum(enum_idx.ref());
}
struct EqualCStringValue {
bool operator()(const char *lhs, const char *rhs) const { return strcmp(lhs, rhs) == 0; }
};
}
template <typename BufferType, typename AttributeType>
class FilterMatchingElementsSearch : public MatchingElementsSearch {
const AttributeType& _attr;
AttributeContent<BufferType> _content;
using EqualFunc = std::conditional_t<std::is_same_v<BufferType, const char *>, EqualCStringValue, std::equal_to<>>;
vespalib::hash_set<BufferType, vespalib::hash<BufferType>, EqualFunc> _matches;
public:
FilterMatchingElementsSearch(const IAttributeVector &attr, EntryRef dictionary_snapshot, vespalib::ConstArrayRef<IDocumentWeightAttribute::LookupResult> dict_entries);
void find_matching_elements(uint32_t doc_id, MatchingElements& result) override;
void initRange(uint32_t begin_id, uint32_t end_id) override;
};
template <typename BufferType, typename AttributeType>
FilterMatchingElementsSearch<BufferType, AttributeType>::FilterMatchingElementsSearch(const IAttributeVector &attr, EntryRef dictionary_snapshot, vespalib::ConstArrayRef<IDocumentWeightAttribute::LookupResult> dict_entries)
: _attr(dynamic_cast<const AttributeType &>(attr)),
_content(),
_matches()
{
auto dwa = attr.asDocumentWeightAttribute();
assert(dwa != nullptr);
auto callback = [this](EntryRef folded) { _matches.insert(get_from_enum(_attr, folded)); };
for (auto &entry : dict_entries) {
if (entry.enum_idx.valid()) {
dwa->collect_folded(entry.enum_idx, dictionary_snapshot, callback);
}
}
}
template <typename BufferType, typename AttributeType>
void
FilterMatchingElementsSearch<BufferType, AttributeType>::find_matching_elements(uint32_t doc_id, MatchingElements& result)
{
_matching_elements.clear();
_content.fill(_attr, doc_id);
uint32_t element_id = 0;
for (auto value : _content) {
if (_matches.find(value) != _matches.end()) {
_matching_elements.push_back(element_id);
}
++element_id;
}
if (!_matching_elements.empty()) {
result.add_matching_elements(doc_id, _attr.getName(), _matching_elements);
}
}
template <typename BufferType, typename AttributeType>
void
FilterMatchingElementsSearch<BufferType, AttributeType>::initRange(uint32_t, uint32_t)
{
}
std::unique_ptr<MatchingElementsSearch>
MatchingElementsSearch::create(const IAttributeVector &attr, EntryRef dictionary_snapshot, vespalib::ConstArrayRef<IDocumentWeightAttribute::LookupResult> dict_entries)
{
switch(attr.getBasicType()) {
case BasicType::INT64:
return std::make_unique<FilterMatchingElementsSearch<int64_t, IntegerAttributeTemplate<int64_t>>>(attr, dictionary_snapshot, dict_entries);
case BasicType::STRING:
return std::make_unique<FilterMatchingElementsSearch<const char *, StringAttribute>>(attr, dictionary_snapshot, dict_entries);
default:
return std::unique_ptr<MatchingElementsSearch>();
}
}
}
namespace vespalib {
template class hash_set<const char *>;
template class hashtable<const char *, const char *, hash<const char *>, search::queryeval::EqualCStringValue, Identity, hashtable_base::and_modulator>;
}
VESPALIB_HASH_SET_INSTANTIATE(int64_t);
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