Function TEST

cpp/src/parquet/statistics_test.cc:81–127

}

TEST(Comparison, SignedByteArray) {
  // Signed byte array comparison is only used for Decimal comparison. When
  // decimals are encoded as byte arrays they use twos complement big-endian
  // encoded values. Comparisons of byte arrays of unequal types need to handle
  // sign extension.
  auto comparator = MakeComparator<ByteArrayType>(Type::BYTE_ARRAY, SortOrder::SIGNED);
  struct Case {
    std::vector<uint8_t> bytes;
    int order;
    ByteArray ToByteArray() const {
      return ByteArray(static_cast<int>(bytes.size()), bytes.data());
    }
  };

  // Test a mix of big-endian comparison values that are both equal and
  // unequal after sign extension.
  std::vector<Case> cases = {
      {{0x80, 0x80, 0, 0}, 0},           {{/*0xFF,*/ 0x80, 0, 0}, 1},
      {{0xFF, 0x80, 0, 0}, 1},           {{/*0xFF,*/ 0xFF, 0x01, 0}, 2},
      {{/*0xFF,  0xFF,*/ 0x80, 0}, 3},   {{/*0xFF,*/ 0xFF, 0x80, 0}, 3},
      {{0xFF, 0xFF, 0x80, 0}, 3},        {{/*0xFF,0xFF,0xFF,*/ 0x80}, 4},
      {{/*0xFF, 0xFF, 0xFF,*/ 0xFF}, 5}, {{/*0, 0,*/ 0x01, 0x01}, 6},
      {{/*0,*/ 0, 0x01, 0x01}, 6},       {{0, 0, 0x01, 0x01}, 6},
      {{/*0,*/ 0x01, 0x01, 0}, 7},       {{0x01, 0x01, 0, 0}, 8}};

  for (size_t x = 0; x < cases.size(); x++) {
    const auto& case1 = cases[x];
    // Empty array is always the smallest values
    EXPECT_TRUE(comparator->Compare(ByteArray(), case1.ToByteArray())) << x;
    EXPECT_FALSE(comparator->Compare(case1.ToByteArray(), ByteArray())) << x;
    // Equals is always false.
    EXPECT_FALSE(comparator->Compare(case1.ToByteArray(), case1.ToByteArray())) << x;

    for (size_t y = 0; y < cases.size(); y++) {
      const auto& case2 = cases[y];
      if (case1.order < case2.order) {
        EXPECT_TRUE(comparator->Compare(case1.ToByteArray(), case2.ToByteArray()))
            << x << " (order: " << case1.order << ") " << y << " (order: " << case2.order
            << ")";
      } else {
        EXPECT_FALSE(comparator->Compare(case1.ToByteArray(), case2.ToByteArray()))
            << x << " (order: " << case1.order << ") " << y << " (order: " << case2.order
            << ")";
      }
    }
  }
}

TEST(Comparison, UnsignedByteArray) {
  // Check if UTF-8 is compared using unsigned correctly