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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Unit tests for hyperloglog.
#include <vespa/log/log.h>
LOG_SETUP("hyperloglog_test");
#include <vespa/searchlib/grouping/hyperloglog.h>
#include <vespa/vespalib/objects/nboserializer.h>
#include <vespa/vespalib/objects/nbostream.h>
#include <vespa/vespalib/testkit/testapp.h>
using vespalib::NBOSerializer;
using vespalib::nbostream;
using namespace search;
namespace {
TEST("require that hyperloglog changes from sparse to normal sketch") {
HyperLogLog<> hll;
for (size_t i = 0; i < 256; ++i) {
EXPECT_TRUE(dynamic_cast<const SparseSketch<> *>(&hll.getSketch()));
EXPECT_EQUAL(1, hll.aggregate(i));
}
EXPECT_TRUE(dynamic_cast<const SparseSketch<> *>(&hll.getSketch()));
EXPECT_EQUAL(23, hll.aggregate(256));
EXPECT_TRUE(dynamic_cast<const NormalSketch<> *>(&hll.getSketch()));
}
TEST("require that hyperloglog can be (de)serialized") {
HyperLogLog<> hll;
for (size_t i = 0; i < 256; ++i) {
EXPECT_EQUAL(1, hll.aggregate(i));
}
nbostream stream;
NBOSerializer serializer(stream);
// Serializes with sparse sketch
hll.serialize(serializer);
HyperLogLog<> hll2;
hll2.deserialize(serializer);
EXPECT_TRUE(dynamic_cast<const SparseSketch<> *>(&hll2.getSketch()));
EXPECT_EQUAL(hll.getSketch(), hll2.getSketch());
// Serializes with normal sketch.
EXPECT_EQUAL(23, hll2.aggregate(256));
hll2.serialize(serializer);
hll.deserialize(serializer);
EXPECT_TRUE(dynamic_cast<const NormalSketch<> *>(&hll.getSketch()));
EXPECT_EQUAL(hll2.getSketch(), hll.getSketch());
}
TEST("require that sparse hyperloglogs can be merged") {
HyperLogLog<> hll;
for (size_t i = 0; i < 100; ++i) {
EXPECT_EQUAL(1, hll.aggregate(i));
}
HyperLogLog<> hll2;
for (size_t i = 100; i < 255; ++i) {
EXPECT_EQUAL(1, hll2.aggregate(i));
}
hll.merge(hll2);
EXPECT_TRUE(dynamic_cast<const SparseSketch<> *>(&hll.getSketch()));
EXPECT_EQUAL(1, hll2.aggregate(255));
hll.merge(hll2);
EXPECT_TRUE(dynamic_cast<const NormalSketch<> *>(&hll.getSketch()));
}
TEST("require that mixed hyperloglogs can be merged") {
HyperLogLog<> hll;
for (size_t i = 0; i < 256; ++i) {
EXPECT_EQUAL(1, hll.aggregate(i));
}
EXPECT_EQUAL(23, hll.aggregate(256)); // normal
HyperLogLog<> hll2;
for (size_t i = 100; i < 255; ++i) {
EXPECT_EQUAL(1, hll2.aggregate(i)); // sparse
}
hll.merge(hll2); // normal + sparse
hll2.merge(hll); // sparse + normal
EXPECT_EQUAL(hll.getSketch(), hll2.getSketch());
EXPECT_EQUAL(23, hll2.aggregate(500));
hll.merge(hll2); // normal + normal
EXPECT_EQUAL(hll.getSketch(), hll2.getSketch());
EXPECT_EQUAL(0, hll.aggregate(500));
}
} // namespace
TEST_MAIN() { TEST_RUN_ALL(); }
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