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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "enumstore.h"
#include "postinglisttraits.h"
#include "ipostinglistsearchcontext.h"
#include <vespa/searchlib/queryeval/searchiterator.h>
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 EnumStoreDictBase &_dictionary;
const btree::BTreeNode::Ref _frozenRootRef;
uint32_t _uniqueValues;
uint32_t _docIdLimit;
uint64_t _numValues; // attr.getStatus().getNumValues();
protected:
EnumHintSearchContext(const EnumStoreDictBase &dictionary,
uint32_t docIdLimit,
uint64_t numValues);
~EnumHintSearchContext();
void lookupTerm(const EnumStoreComparator &comp);
void lookupRange(const EnumStoreComparator &low, const EnumStoreComparator &high);
queryeval::SearchIterator::UP
createPostingIterator(fef::TermFieldMatchData *matchData, bool strict) override;
void fetchPostings(bool strict, const BitVector * filter) override;
unsigned int approximateHits() const override;
};
}
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