Method CheckNaNs

cpp/src/parquet/statistics_test.cc:1464–1485

  // PARQUET-1225: Float NaN values may lead to incorrect min-max
  template <typename Values>
  void CheckNaNs(ColumnDescriptor* descr, const Values& all_nans, const Values& some_nans,
                 const Values& other_nans, c_type min, c_type max, uint8_t valid_bitmap,
                 uint8_t valid_bitmap_no_nans) {
    auto some_nan_stats = MakeStatistics<ParquetType>(descr);
    // Ingesting only nans should not yield valid min max
    AssertUnsetMinMax(some_nan_stats, all_nans);
    // Ingesting a mix of NaNs and non-NaNs should yield a valid min max.
    AssertMinMaxAre(some_nan_stats, some_nans, min, max);
    // Ingesting only nans after a valid min/max, should have no effect
    AssertMinMaxAre(some_nan_stats, all_nans, min, max);

    some_nan_stats = MakeStatistics<ParquetType>(descr);
    AssertUnsetMinMax(some_nan_stats, all_nans, &valid_bitmap);
    // NaNs should not pollute min max when excluded via null bitmap.
    AssertMinMaxAre(some_nan_stats, some_nans, &valid_bitmap_no_nans, min, max);
    // Ingesting NaNs with a null bitmap should not change the result.
    AssertMinMaxAre(some_nan_stats, some_nans, &valid_bitmap, min, max);

    // An array that doesn't start with NaN
    auto other_stats = MakeStatistics<ParquetType>(descr);
    AssertMinMaxAre(other_stats, other_nans, min, max);
  }

  void TestNaNs();
  void TestInfinities();