Add Apache Arrow stream writers #147
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| #ifdef USE_ARROW | ||
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| #include "arrow_output_stream.h" | ||
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| std::shared_ptr<ApacheArrowWriter> ArrowOutputStream::create_arrow_file(const std::string& arrow_file_type, | ||
| const std::string& arrow_file_path, | ||
| const std::vector<std::string>& header) { | ||
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| std::string arrow_file_type_upper = Nyxus::toupper(arrow_file_type); | ||
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| if(arrow_file_path != "" && !fs::is_directory(arrow_file_path) && !(Nyxus::ends_with_substr(arrow_file_path, ".arrow") || Nyxus::ends_with_substr(arrow_file_path, ".feather") || Nyxus::ends_with_substr(arrow_file_path, ".parquet"))) { | ||
| throw std::invalid_argument("The arrow file path must end in \".arrow\""); | ||
| } | ||
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| if (!(arrow_file_type_upper == "ARROW" || arrow_file_type_upper == "ARROWIPC" || arrow_file_type_upper == "PARQUET")) { | ||
| throw std::invalid_argument("The valid file types are ARROW, ARROWIPC, or PARQUET"); | ||
| } | ||
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| std::string extension = (arrow_file_type_upper == "PARQUET") ? ".parquet" : ".arrow"; | ||
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| if (arrow_file_path == "") { | ||
| arrow_file_path_ = "NyxusFeatures" + extension; | ||
| } else { | ||
| arrow_file_path_ = arrow_file_path; | ||
| } | ||
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| if (fs::is_directory(arrow_file_path)) { | ||
| arrow_file_path_ += "/NyxusFeatures" + extension; | ||
| } | ||
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| writer_ = WriterFactory::create_writer(arrow_file_path_, header); | ||
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| return writer_; | ||
| } | ||
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| std::shared_ptr<arrow::Table> ArrowOutputStream::get_arrow_table(const std::string& file_path, arrow::Status& table_status) { | ||
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| if (this->arrow_table_ != nullptr) return this->arrow_table_; | ||
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| this->arrow_table_ = writer_->get_arrow_table(file_path, table_status); | ||
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| return this->arrow_table_; | ||
| } | ||
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| std::string ArrowOutputStream::get_arrow_path() { | ||
| return arrow_file_path_; | ||
| } | ||
| #endif | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| #pragma once | ||
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| #ifdef USE_ARROW | ||
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| #include <string> | ||
| #include <memory> | ||
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| #include "output_writers.h" | ||
| #include "helpers/helpers.h" | ||
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| #include <arrow/table.h> | ||
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| #if __has_include(<filesystem>) | ||
| #include <filesystem> | ||
| namespace fs = std::filesystem; | ||
| #elif __has_include(<experimental/filesystem>) | ||
| #include <experimental/filesystem> | ||
| namespace fs = std::experimental::filesystem; | ||
| #else | ||
| error "Missing the <filesystem> header." | ||
| #endif | ||
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| /** | ||
| * @brief Class to write to Apache Arrow formats | ||
| * | ||
| * This class provides methods for writing to the Arrow IPC and Parquet formats. | ||
| * | ||
| */ | ||
| class ArrowOutputStream { | ||
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| private: | ||
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| std::string arrow_file_path_ = ""; | ||
| std::shared_ptr<ApacheArrowWriter> writer_ = nullptr; | ||
| std::string arrow_output_type_ = ""; | ||
| std::shared_ptr<arrow::Table> arrow_table_ = nullptr; | ||
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| public: | ||
| std::shared_ptr<ApacheArrowWriter> create_arrow_file(const std::string& arrow_file_type, | ||
| const std::string& arrow_file_path, | ||
| const std::vector<std::string>& header); | ||
| std::shared_ptr<arrow::Table> get_arrow_table(const std::string& file_path, arrow::Status& table_status); | ||
|
There was a problem hiding this comment. This function call should change in a subsequent PR not to pass a ref to retrieve an error/status code. Instead the caller code will check for |
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| std::string get_arrow_path(); | ||
| }; | ||
| #endif | ||
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How a user can specify via arrow_file_type_upper that the desired format is ".feather" ?