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108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
#include "ArrowBufferedStreams.h"
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#if USE_ARROW || USE_ORC || USE_PARQUET
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#include <IO/ReadBufferFromFileDescriptor.h>
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#include <IO/WriteBufferFromString.h>
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#include <IO/copyData.h>
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#include <arrow/buffer.h>
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#include <arrow/io/api.h>
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#include <arrow/status.h>
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#include <sys/stat.h>
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namespace DB
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{
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ArrowBufferedOutputStream::ArrowBufferedOutputStream(WriteBuffer & out_) : out{out_}, is_open{true}
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{
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}
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arrow::Status ArrowBufferedOutputStream::Close()
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{
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is_open = false;
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return arrow::Status::OK();
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}
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arrow::Status ArrowBufferedOutputStream::Tell(int64_t * position) const
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{
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*position = total_length;
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return arrow::Status::OK();
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}
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arrow::Status ArrowBufferedOutputStream::Write(const void * data, int64_t length)
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{
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out.write(reinterpret_cast<const char *>(data), length);
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total_length += length;
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return arrow::Status::OK();
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}
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RandomAccessFileFromSeekableReadBuffer::RandomAccessFileFromSeekableReadBuffer(SeekableReadBuffer & in_, off_t file_size_)
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: in{in_}, file_size{file_size_}, is_open{true}
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{
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::GetSize(int64_t * size)
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{
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*size = file_size;
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return arrow::Status::OK();
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::Close()
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{
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is_open = false;
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return arrow::Status::OK();
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::Tell(int64_t * position) const
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{
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*position = in.getPosition();
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return arrow::Status::OK();
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::Read(int64_t nbytes, int64_t * bytes_read, void * out)
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{
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*bytes_read = in.readBig(reinterpret_cast<char *>(out), nbytes);
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return arrow::Status::OK();
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::Read(int64_t nbytes, std::shared_ptr<arrow::Buffer> * out)
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{
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std::shared_ptr<arrow::Buffer> buf;
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ARROW_RETURN_NOT_OK(arrow::AllocateBuffer(nbytes, &buf));
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size_t n = in.readBig(reinterpret_cast<char *>(buf->mutable_data()), nbytes);
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*out = arrow::SliceBuffer(buf, 0, n);
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return arrow::Status::OK();
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}
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arrow::Status RandomAccessFileFromSeekableReadBuffer::Seek(int64_t position)
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{
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in.seek(position, SEEK_SET);
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return arrow::Status::OK();
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}
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std::shared_ptr<arrow::io::RandomAccessFile> asArrowFile(ReadBuffer & in)
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{
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if (auto * fd_in = dynamic_cast<ReadBufferFromFileDescriptor *>(&in))
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{
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struct stat stat;
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auto res = ::fstat(fd_in->getFD(), &stat);
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// if fd is a regular file i.e. not stdin
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if (res == 0 && S_ISREG(stat.st_mode))
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return std::make_shared<RandomAccessFileFromSeekableReadBuffer>(*fd_in, stat.st_size);
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}
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// fallback to loading the entire file in memory
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std::string file_data;
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{
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WriteBufferFromString file_buffer(file_data);
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copyData(in, file_buffer);
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}
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return std::make_shared<arrow::io::BufferReader>(arrow::Buffer::FromString(std::move(file_data)));
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}
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}
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#endif
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