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arrow-stream-to-file.rs
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arrow-stream-to-file.rs
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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.
use std::io;
use arrow2::error::Result;
use arrow2::io::ipc::read;
use arrow2::io::ipc::write;
fn main() -> Result<()> {
let mut reader = io::stdin();
let metadata = read::read_stream_metadata(&mut reader)?;
let mut arrow_stream_reader = read::StreamReader::new(reader, metadata.clone(), None);
let writer = io::stdout();
let options = write::WriteOptions { compression: None };
let mut writer = write::FileWriter::try_new(
writer,
&metadata.schema,
Some(metadata.ipc_schema.fields),
options,
)?;
arrow_stream_reader.try_for_each(|batch| writer.write(&batch?.unwrap(), None))?;
writer.finish()?;
Ok(())
}