Method TestMerge

cpp/src/parquet/statistics_test.cc:380–402

  }

  void TestMerge() {
    int num_null[2];
    random_numbers(2, 42, 0, 100, num_null);

    auto statistics1 = MakeStatistics<TestType>(this->schema_.Column(0));
    this->GenerateData(1000);
    statistics1->Update(this->values_ptr_, this->values_.size() - num_null[0],
                        num_null[0]);

    auto statistics2 = MakeStatistics<TestType>(this->schema_.Column(0));
    this->GenerateData(1000);
    statistics2->Update(this->values_ptr_, this->values_.size() - num_null[1],
                        num_null[1]);

    auto total = MakeStatistics<TestType>(this->schema_.Column(0));
    total->Merge(*statistics1);
    total->Merge(*statistics2);

    ASSERT_EQ(num_null[0] + num_null[1], total->null_count());
    ASSERT_EQ(this->values_.size() * 2 - num_null[0] - num_null[1], total->num_values());
    ASSERT_EQ(total->min(), std::min(statistics1->min(), statistics2->min()));
    ASSERT_EQ(total->max(), std::max(statistics1->max(), statistics2->max()));
  }

  void TestEquals() {
    const auto n_values = 1;