File size: 2,498 Bytes
8334cee |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 |
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#pragma once
#include <cstdint>
#include <optional>
#include <string>
#include <variant>
#include "arrow/util/visibility.h"
namespace arrow {
/// \brief Statistics for an Array
///
/// Apache Arrow format doesn't have statistics but data source such
/// as Apache Parquet may have statistics. Statistics associated with
/// data source can be read unified API via this class.
struct ARROW_EXPORT ArrayStatistics {
using ValueType = std::variant<bool, int64_t, uint64_t, double, std::string>;
/// \brief The number of null values, may not be set
std::optional<int64_t> null_count = std::nullopt;
/// \brief The number of distinct values, may not be set
std::optional<int64_t> distinct_count = std::nullopt;
/// \brief The minimum value, may not be set
std::optional<ValueType> min = std::nullopt;
/// \brief Whether the minimum value is exact or not
bool is_min_exact = false;
/// \brief The maximum value, may not be set
std::optional<ValueType> max = std::nullopt;
/// \brief Whether the maximum value is exact or not
bool is_max_exact = false;
/// \brief Check two statistics for equality
bool Equals(const ArrayStatistics& other) const {
return null_count == other.null_count && distinct_count == other.distinct_count &&
min == other.min && is_min_exact == other.is_min_exact && max == other.max &&
is_max_exact == other.is_max_exact;
}
/// \brief Check two statistics for equality
bool operator==(const ArrayStatistics& other) const { return Equals(other); }
/// \brief Check two statistics for not equality
bool operator!=(const ArrayStatistics& other) const { return !Equals(other); }
};
} // namespace arrow
|