70 lines
2.4 KiB
C++
Executable File
70 lines
2.4 KiB
C++
Executable File
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <variant>
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#include "arrow/util/visibility.h"
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namespace arrow {
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/// \brief Statistics for an Array
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///
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/// Apache Arrow format doesn't have statistics but data source such
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/// as Apache Parquet may have statistics. Statistics associated with
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/// data source can be read unified API via this class.
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struct ARROW_EXPORT ArrayStatistics {
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using ValueType = std::variant<bool, int64_t, uint64_t, double, std::string>;
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/// \brief The number of null values, may not be set
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std::optional<int64_t> null_count = std::nullopt;
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/// \brief The number of distinct values, may not be set
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std::optional<int64_t> distinct_count = std::nullopt;
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/// \brief The minimum value, may not be set
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std::optional<ValueType> min = std::nullopt;
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/// \brief Whether the minimum value is exact or not
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bool is_min_exact = false;
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/// \brief The maximum value, may not be set
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std::optional<ValueType> max = std::nullopt;
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/// \brief Whether the maximum value is exact or not
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bool is_max_exact = false;
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/// \brief Check two statistics for equality
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bool Equals(const ArrayStatistics& other) const {
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return null_count == other.null_count && distinct_count == other.distinct_count &&
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min == other.min && is_min_exact == other.is_min_exact && max == other.max &&
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is_max_exact == other.is_max_exact;
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}
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/// \brief Check two statistics for equality
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bool operator==(const ArrayStatistics& other) const { return Equals(other); }
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/// \brief Check two statistics for not equality
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bool operator!=(const ArrayStatistics& other) const { return !Equals(other); }
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};
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} // namespace arrow
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