How to Read Parquet Files in Rust

Use the parquet crate with the arrow ecosystem to read Parquet files in Rust. Add the dependencies to your Cargo.toml and use ParquetRecordBatchReaderBuilder to stream the data into Arrow batches.

[dependencies]
parquet = "51"
arrow = "51"

use std::fs::File;
use parquet::arrow::ParquetRecordBatchReaderBuilder;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = File::open("data.parquet")?;
    let builder = ParquetRecordBatchReaderBuilder::try_new(file)?;
    let mut reader = builder.build()?;
    
    while let Some(batch_result) = reader.next() {
        let batch = batch_result?;
        println!("Read {} rows", batch.num_rows());
    }
    Ok(())
}

Parquet is a file format that stores data in a compressed, column-oriented way, making it very fast for analytics. In Rust, you use a library called parquet to open these files and convert the data into a standard table format called Arrow. Think of it like using a specialized key to unlock a high-speed data vault and read the contents row by row.