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126
include/sparrow/arrow_interface/arrow_array_schema_factory.hpp
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| // Copyright 2024 Man Group Operations Limited | ||
| // | ||
| // Licensed 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. | ||
|
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| #pragma once | ||
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| #include <cstdint> | ||
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| #include "sparrow/arrow_interface/arrow_array.hpp" | ||
| #include "sparrow/arrow_interface/arrow_schema.hpp" | ||
| #include "sparrow/buffer/buffer.hpp" | ||
| #include "sparrow/buffer/dynamic_bitset.hpp" | ||
| #include "sparrow/c_interface.hpp" | ||
| #include "sparrow/types/data_type.hpp" | ||
| #include "sparrow/utils/buffers.hpp" | ||
| #include "sparrow/utils/offsets.hpp" | ||
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| namespace sparrow | ||
| { | ||
| inline ArrowSchema make_dictionary_encoded_arrow_schema(data_type value_data_type, data_type keys_data_type) | ||
| { | ||
| ArrowSchema* values_schema = new ArrowSchema; | ||
| fill_arrow_schema( | ||
| *values_schema, | ||
| data_type_to_format(value_data_type), | ||
| "dictionary values", | ||
| std::nullopt, | ||
| std::nullopt, | ||
| 0, | ||
| nullptr, | ||
| nullptr | ||
| ); | ||
|
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| ArrowSchema keys_schema = make_arrow_schema( | ||
| data_type_to_format(keys_data_type), | ||
| "dictionary keys", | ||
| std::nullopt, | ||
| std::nullopt, | ||
| 0, | ||
| nullptr, | ||
| values_schema | ||
| ); | ||
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| return keys_schema; | ||
| } | ||
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| template <std::ranges::range R> | ||
| requires(std::integral<std::ranges::range_value_t<R>>) | ||
| buffer<uint8_t> make_bitmap_buffer(size_t count, R&& nulls) | ||
| { | ||
| if (!std::ranges::empty(nulls)) | ||
| { | ||
| SPARROW_ASSERT_TRUE(*std::ranges::max_element(nulls) < count); | ||
| } | ||
| dynamic_bitset<uint8_t> bitmap(count, true); | ||
| for (const auto i : nulls) | ||
| { | ||
| bitmap.set(i, false); | ||
| } | ||
| return bitmap.buffer(); | ||
| }; | ||
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| template <layout_offset offset_type, std::ranges::sized_range Values, std::ranges::sized_range Nulls> | ||
| requires std::integral<std::ranges::range_value_t<Nulls>> | ||
| constexpr ArrowArray make_variable_size_binary_arrow_array(Values&& range, Nulls&& nulls, int64_t offset) | ||
| { | ||
| const auto length = static_cast<int64_t>(std::ranges::size(range)) - offset; | ||
| const auto null_count = static_cast<int64_t>(std::ranges::size(nulls)); | ||
| std::vector<buffer<uint8_t>> value_buffers{ | ||
| make_bitmap_buffer(std::ranges::size(range), std::move(nulls)), | ||
| range_to_buffer(make_offset_buffer<offset_type>(range)), | ||
| strings_to_buffer(std::move(range)) | ||
| }; | ||
| return make_arrow_array(length, null_count, offset, std::move(value_buffers), 0, nullptr, nullptr); | ||
| } | ||
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| template <std::ranges::sized_range Values, std::ranges::sized_range Nulls> | ||
| requires std::is_arithmetic_v<std::ranges::range_value_t<Values>> | ||
| && std::integral<std::ranges::range_value_t<Nulls>> | ||
| constexpr ArrowArray make_primitive_arrow_array(Values&& range, Nulls&& nulls, int64_t offset) | ||
| { | ||
| const int64_t length = static_cast<int64_t>(std::ranges::size(range)) - offset; | ||
| const auto null_count = static_cast<int64_t>(std::ranges::size(nulls)); | ||
| std::vector<buffer<uint8_t>> value_buffers{ | ||
| make_bitmap_buffer(std::ranges::size(range), std::move(nulls)), | ||
| range_to_buffer(std::move(range)) | ||
| }; | ||
| return make_arrow_array(length, null_count, offset, std::move(value_buffers), 0, nullptr, nullptr); | ||
| } | ||
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| template < | ||
| std::ranges::sized_range Keys, | ||
| std::ranges::sized_range KeyNulls, | ||
| std::ranges::sized_range Values, | ||
| std::ranges::sized_range ValuesNulls> | ||
| requires std::integral<std::ranges::range_value_t<Keys>> | ||
| && std::integral<std::ranges::range_value_t<KeyNulls>> | ||
| ArrowArray make_dictionary_encoded_arrow_array( | ||
| Keys&& keys, | ||
| KeyNulls&& keys_nulls, | ||
| int64_t keys_offset, | ||
| Values&& values, | ||
| ValuesNulls&& values_nulls, | ||
| int64_t values_offset | ||
| ) | ||
| { | ||
| ArrowArray keys_arrow_array = make_primitive_arrow_array(keys, keys_nulls, keys_offset); | ||
| keys_arrow_array.dictionary = new ArrowArray; | ||
| *keys_arrow_array.dictionary = make_variable_size_binary_arrow_array<int32_t>( | ||
| std::move(values), | ||
| std::move(values_nulls), | ||
| values_offset | ||
| ); | ||
| return keys_arrow_array; | ||
| } | ||
| } |
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