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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "global_filter.h"
#include "blueprint.h"
#include <vespa/vespalib/util/require.h>
#include <vespa/vespalib/util/thread_bundle.h>
#include <vespa/searchlib/common/bitvector.h>
#include <cassert>
using vespalib::Runnable;
using vespalib::ThreadBundle;
using vespalib::Trinary;
namespace search::queryeval {
namespace {
struct Inactive : GlobalFilter {
bool is_active() const override { return false; }
uint32_t size() const override { abort(); }
uint32_t count() const override { abort(); }
bool check(uint32_t) const override { abort(); }
};
struct EmptyFilter : GlobalFilter {
uint32_t docid_limit;
EmptyFilter(uint32_t docid_limit_in) : docid_limit(docid_limit_in) {}
bool is_active() const override { return true; }
uint32_t size() const override { return docid_limit; }
uint32_t count() const override { return 0; }
bool check(uint32_t) const override { return false; }
};
struct BitVectorFilter : public GlobalFilter {
std::unique_ptr<BitVector> vector;
BitVectorFilter(std::unique_ptr<BitVector> vector_in)
: vector(std::move(vector_in)) {}
bool is_active() const override { return true; }
uint32_t size() const override { return vector->size(); }
uint32_t count() const override { return vector->countTrueBits(); }
bool check(uint32_t docid) const override { return vector->testBit(docid); }
};
struct MultiBitVectorFilter : public GlobalFilter {
std::vector<std::unique_ptr<BitVector>> vectors;
std::vector<uint32_t> splits;
uint32_t total_size;
uint32_t total_count;
MultiBitVectorFilter(std::vector<std::unique_ptr<BitVector>> vectors_in,
std::vector<uint32_t> splits_in,
uint32_t total_size_in,
uint32_t total_count_in)
: vectors(std::move(vectors_in)),
splits(std::move(splits_in)),
total_size(total_size_in),
total_count(total_count_in) {}
bool is_active() const override { return true; }
uint32_t size() const override { return total_size; }
uint32_t count() const override { return total_count; }
bool check(uint32_t docid) const override {
size_t i = 0;
while ((i < splits.size()) && (docid >= splits[i])) {
++i;
}
return vectors[i]->testBit(docid);
}
};
struct PartResult {
Trinary matches_any;
std::unique_ptr<BitVector> bits;
PartResult()
: matches_any(Trinary::False), bits() {}
PartResult(Trinary matches_any_in)
: matches_any(matches_any_in), bits() {}
PartResult(std::unique_ptr<BitVector> &&bits_in)
: matches_any(Trinary::Undefined), bits(std::move(bits_in)) {}
};
PartResult make_part(Blueprint &blueprint, uint32_t begin, uint32_t end) {
bool strict = true;
auto constraint = Blueprint::FilterConstraint::UPPER_BOUND;
auto filter = blueprint.createFilterSearch(strict, constraint);
auto matches_any = filter->matches_any();
if (matches_any == Trinary::Undefined) {
filter->initRange(begin, end);
auto bits = filter->get_hits(begin);
// count bits in parallel and cache the results for later
bits->countTrueBits();
return PartResult(std::move(bits));
} else {
return PartResult(matches_any);
}
}
struct MakePart : Runnable {
Blueprint &blueprint;
uint32_t begin;
uint32_t end;
PartResult result;
MakePart(Blueprint &blueprint_in, uint32_t begin_in, uint32_t end_in) noexcept
: blueprint(blueprint_in), begin(begin_in), end(end_in), result() {}
void run() override { result = make_part(blueprint, begin, end); }
};
}
GlobalFilter::GlobalFilter() = default;
GlobalFilter::~GlobalFilter() = default;
std::shared_ptr<GlobalFilter>
GlobalFilter::create() {
return std::make_shared<Inactive>();
}
std::shared_ptr<GlobalFilter>
GlobalFilter::create(std::vector<uint32_t> docids, uint32_t size)
{
uint32_t prev = 0;
auto bits = BitVector::create(1, size);
for (uint32_t docid: docids) {
REQUIRE(docid > prev);
REQUIRE(docid < size);
bits->setBit(docid);
prev = docid;
}
bits->invalidateCachedCount();
return create(std::move(bits));
}
std::shared_ptr<GlobalFilter>
GlobalFilter::create(std::unique_ptr<BitVector> vector)
{
return std::make_shared<BitVectorFilter>(std::move(vector));
}
std::shared_ptr<GlobalFilter>
GlobalFilter::create(std::vector<std::unique_ptr<BitVector>> vectors)
{
uint32_t total_size = 1;
uint32_t total_count = 0;
std::vector<uint32_t> splits;
splits.reserve(vectors.size());
for (size_t i = 0; i < vectors.size(); ++i) {
bool last = ((i + 1) == vectors.size());
total_count += vectors[i]->countTrueBits();
if (last) {
total_size = vectors[i]->size();
} else {
REQUIRE_EQ(vectors[i]->size(), vectors[i + 1]->getStartIndex());
splits.push_back(vectors[i]->size());
}
}
return std::make_shared<MultiBitVectorFilter>(std::move(vectors), std::move(splits),
total_size, total_count);
}
std::shared_ptr<GlobalFilter>
GlobalFilter::create(Blueprint &blueprint, uint32_t docid_limit, ThreadBundle &thread_bundle)
{
uint32_t num_threads = thread_bundle.size();
std::vector<MakePart> parts;
parts.reserve(num_threads);
uint32_t docid = 1;
uint32_t per_thread = (docid_limit - docid) / num_threads;
uint32_t rest_docs = (docid_limit - docid) % num_threads;
while (docid < docid_limit) {
uint32_t part_size = per_thread + (parts.size() < rest_docs);
parts.emplace_back(blueprint, docid, docid + part_size);
docid += part_size;
}
assert(parts.size() <= num_threads);
assert((docid == docid_limit) || parts.empty());
thread_bundle.run(parts);
std::vector<std::unique_ptr<BitVector>> vectors;
vectors.reserve(parts.size());
for (MakePart &part: parts) {
switch (part.result.matches_any) {
case Trinary::False: return std::make_unique<EmptyFilter>(docid_limit);
case Trinary::True: return create(); // filter not needed after all
case Trinary::Undefined:
vectors.push_back(std::move(part.result.bits));
}
}
if (vectors.size() == 1) {
return create(std::move(vectors[0]));
}
return create(std::move(vectors));
}
}
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