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// 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 #include #include #include #include "arrow/compare.h" #include "arrow/type.h" #include "arrow/util/visibility.h" namespace arrow { /// \class ArrayStatistics /// \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 { /// \brief The type for maximum and minimum values. If the target /// value exists, one of them is used. `std::nullopt` is used /// otherwise. using ValueType = std::variant; using NumericType = std::variant; using CountType = NumericType; using SizeType = NumericType; static const std::shared_ptr& ValueToArrowType( const std::optional& value, const std::shared_ptr& array_type) { if (!value.has_value()) { return null(); } struct Visitor { const std::shared_ptr& array_type; const std::shared_ptr& operator()(const bool&) { return boolean(); } const std::shared_ptr& operator()(const int64_t&) { return int64(); } const std::shared_ptr& operator()(const uint64_t&) { return uint64(); } const std::shared_ptr& operator()(const double&) { return float64(); } const std::shared_ptr& operator()(const std::string&) { switch (array_type->id()) { case Type::STRING: case Type::BINARY: case Type::FIXED_SIZE_BINARY: case Type::LARGE_STRING: case Type::LARGE_BINARY: case Type::BINARY_VIEW: case Type::STRING_VIEW: return array_type; default: return utf8(); } } } visitor{array_type}; return std::visit(visitor, value.value()); } /// \brief The number of rows, may not be set /// Note: when set to `int64_t`, it represents `exact_row_count`, /// and when set to `double`, it represents `approximate_row_count`. /// Note: this value is not used by \ref arrow::RecordBatch::MakeStatisticsArray. std::optional row_count = std::nullopt; /// \brief The number of null values, may not be set /// Note: when set to `int64_t`, it represents `exact_null_count`, /// and when set to `double`, it represents `approximate_null_count`. std::optional null_count = std::nullopt; /// \brief The number of distinct values, may not be set /// Note: when set to `int64_t`, it represents `exact_distinct_count`, /// and when set to `double`, it represents `approximate_distinct_count`. std::optional distinct_count = std::nullopt; /// \brief The maximum length in bytes of the rows in an array; may not be set /// Note: when the type is `int64_t`, it represents `max_byte_width_exact`, /// and when the type is `double`, it represents `max_byte_width_approximate`. std::optional max_byte_width = std::nullopt; /// \brief The average size in bytes of a row in an array, may not be set. std::optional average_byte_width = std::nullopt; /// \brief Whether the average size in bytes is exact or not. bool is_average_byte_width_exact = false; /// \brief The minimum value, may not be set std::optional min = std::nullopt; /// \brief Compute Arrow type of the minimum value. /// /// If \ref ValueType is `std::string`, `array_type` may be /// used. If `array_type` is a binary-like type such as \ref /// arrow::binary and \ref arrow::large_utf8, `array_type` is /// returned. \ref arrow::utf8 is returned otherwise. /// /// If \ref ValueType isn't `std::string`, `array_type` isn't used. /// /// \param array_type The Arrow type of the associated array. /// /// \return \ref arrow::null if the minimum value is `std::nullopt`, /// Arrow type based on \ref ValueType of the \ref min /// otherwise. const std::shared_ptr& MinArrowType( const std::shared_ptr& array_type) { return ValueToArrowType(min, array_type); } /// \brief Whether the minimum value is exact or not bool is_min_exact = false; /// \brief The maximum value, may not be set std::optional max = std::nullopt; /// \brief Compute Arrow type of the maximum value. /// /// If \ref ValueType is `std::string`, `array_type` may be /// used. If `array_type` is a binary-like type such as \ref /// arrow::binary and \ref arrow::large_utf8, `array_type` is /// returned. \ref arrow::utf8 is returned otherwise. /// /// If \ref ValueType isn't `std::string`, `array_type` isn't used. /// /// \param array_type The Arrow type of the associated array. /// /// \return \ref arrow::null if the maximum value is `std::nullopt`, /// Arrow type based on \ref ValueType of the \ref max /// otherwise. const std::shared_ptr& MaxArrowType( const std::shared_ptr& array_type) { return ValueToArrowType(max, array_type); } /// \brief Whether the maximum value is exact or not bool is_max_exact = false; /// \brief Check two \ref arrow::ArrayStatistics for equality /// /// \param other The \ref arrow::ArrayStatistics instance to compare against. /// /// \param equal_options Options used to compare double values for equality. /// /// \return True if the two \ref arrow::ArrayStatistics instances are equal; otherwise, /// false. bool Equals(const ArrayStatistics& other, const EqualOptions& equal_options = EqualOptions::Defaults()) const { return ArrayStatisticsEquals(*this, other, equal_options); } /// \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