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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 <vespa/searchcommon/attribute/hit_estimate.h>
#include <memory>
namespace search::queryeval {
class SearchIterator;
class ExecuteInfo;
}
namespace search::fef { class TermFieldMatchData; }
namespace search::attribute {
/**
* Interface for search context helper classes to create attribute
* search iterators based on posting lists and using dictionary
* information to better estimate number of hits. Also used for
* enumerated attributes without posting lists to eliminate brute
* force searches for nonexisting values.
*/
class IPostingListSearchContext
{
protected:
IPostingListSearchContext() { }
virtual ~IPostingListSearchContext() { }
public:
virtual void fetchPostings(const queryeval::ExecuteInfo & execInfo, bool strict) = 0;
virtual std::unique_ptr<queryeval::SearchIterator> createPostingIterator(fef::TermFieldMatchData *matchData, bool strict) = 0;
virtual HitEstimate calc_hit_estimate() const = 0;
};
}
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