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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "enumhintsearchcontext.h"
#include "i_enum_store_dictionary.h"
#include <vespa/searchlib/queryeval/emptysearch.h>
#include <vespa/vespalib/datastore/i_unique_store_dictionary_read_snapshot.h>
namespace search::attribute {
using queryeval::SearchIterator;
using fef::TermFieldMatchData;
EnumHintSearchContext::
EnumHintSearchContext(const IEnumStoreDictionary &dictionary,
uint32_t docIdLimit,
uint64_t numValues)
: _dict_snapshot(dictionary.get_read_snapshot()),
_uniqueValues(0u),
_docIdLimit(docIdLimit),
_numValues(numValues)
{
}
EnumHintSearchContext::~EnumHintSearchContext() = default;
void
EnumHintSearchContext::lookupTerm(const vespalib::datastore::EntryComparator &comp)
{
_uniqueValues = _dict_snapshot->count(comp);
}
void
EnumHintSearchContext::lookupRange(const vespalib::datastore::EntryComparator &low,
const vespalib::datastore::EntryComparator &high)
{
_uniqueValues = _dict_snapshot->count_in_range(low, high);
}
void
EnumHintSearchContext::fetchPostings(const queryeval::ExecuteInfo &)
{
}
SearchIterator::UP
EnumHintSearchContext::createPostingIterator(TermFieldMatchData *, bool )
{
return (_uniqueValues == 0u)
? std::make_unique<queryeval::EmptySearch>()
: SearchIterator::UP();
}
unsigned int
EnumHintSearchContext::approximateHits() const
{
return (_uniqueValues == 0u)
? 0u
: std::max(uint64_t(_docIdLimit), _numValues);
}
}
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