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Copy pathfile_to_stream.cc
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64 lines (55 loc) · 2.14 KB
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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.
#include <iostream>
#include <memory>
#include <string>
#include "arrow/io/file.h"
#include "arrow/io/stdio.h"
#include "arrow/ipc/reader.h"
#include "arrow/ipc/writer.h"
#include "arrow/result.h"
#include "arrow/status.h"
namespace arrow {
class RecordBatch;
namespace ipc {
// Reads a file on the file system and prints to stdout the stream version of it.
Status ConvertToStream(const char* path) {
io::StdoutStream sink;
ARROW_ASSIGN_OR_RAISE(auto in_file, io::ReadableFile::Open(path));
ARROW_ASSIGN_OR_RAISE(auto reader, ipc::RecordBatchFileReader::Open(in_file.get()));
ARROW_ASSIGN_OR_RAISE(auto writer, ipc::MakeStreamWriter(&sink, reader->schema(),
IpcWriteOptions::Defaults()));
for (int i = 0; i < reader->num_record_batches(); ++i) {
ARROW_ASSIGN_OR_RAISE(std::shared_ptr<RecordBatch> chunk, reader->ReadRecordBatch(i));
RETURN_NOT_OK(writer->WriteRecordBatch(*chunk));
}
return writer->Close();
}
} // namespace ipc
} // namespace arrow
int main(int argc, char** argv) {
if (argc != 2) {
std::cerr << "Usage: file-to-stream <input arrow file>" << std::endl;
return 1;
}
arrow::Status status = arrow::ipc::ConvertToStream(argv[1]);
if (!status.ok()) {
std::cerr << "Could not convert to stream: " << status.ToString() << std::endl;
return 1;
}
return 0;
}