arrow_file_to_stream/
arrow-file-to-stream.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18//! Converts an Arrow IPC file to an Arrow IPC stream.
19
20use arrow::error::Result;
21use arrow::ipc::reader::FileReader;
22use arrow::ipc::writer::StreamWriter;
23use clap::Parser;
24use std::fs::File;
25use std::io::{self, BufReader};
26
27#[derive(Debug, Parser)]
28#[clap(author, version, about("Read an arrow file and stream to stdout"), long_about = None)]
29struct Args {
30    file_name: String,
31}
32
33fn main() -> Result<()> {
34    let args = Args::parse();
35    let f = File::open(args.file_name)?;
36    let reader = BufReader::new(f);
37    let mut reader = FileReader::try_new(reader, None)?;
38    let schema = reader.schema();
39
40    let mut writer = StreamWriter::try_new(io::stdout(), &schema)?;
41
42    reader.try_for_each(|batch| {
43        let batch = batch?;
44        writer.write(&batch)
45    })?;
46    writer.finish()?;
47
48    Ok(())
49}
arrow_file_to_stream/arrow-file-to-stream.rs

arrow_file_to_stream/
arrow-file-to-stream.rs
