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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 "ipostinglistsearchcontext.h"
namespace vespalib::datastore {
class EntryComparator;
class IUniqueStoreDictionaryReadSnapshot;
}
namespace search { class IEnumStoreDictionary; }
namespace search::attribute {
/**
* Search context helper for enumerated attributes, used to eliminate
* searches for values that are not present at all.
*/
class EnumHintSearchContext : public IPostingListSearchContext
{
const std::unique_ptr<vespalib::datastore::IUniqueStoreDictionaryReadSnapshot> _dict_snapshot;
uint32_t _uniqueValues;
uint32_t _docIdLimit;
uint64_t _numValues; // attr.getStatus().getNumValues();
protected:
EnumHintSearchContext(const IEnumStoreDictionary &dictionary,
uint32_t docIdLimit,
uint64_t numValues);
~EnumHintSearchContext() override;
public:
void lookupTerm(const vespalib::datastore::EntryComparator &comp);
void lookupRange(const vespalib::datastore::EntryComparator &low, const vespalib::datastore::EntryComparator &high);
protected:
std::unique_ptr<queryeval::SearchIterator>
createPostingIterator(fef::TermFieldMatchData *matchData, bool strict) override;
void fetchPostings(const queryeval::ExecuteInfo & execInfo, bool strict) override;
HitEstimate calc_hit_estimate() const override;
uint32_t get_committed_docid_limit() const noexcept { return _docIdLimit; }
};
}
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