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# Apache Parquet Official Native Rust Implementation

[![crates.io](https://img.shields.io/crates/v/parquet.svg)](https://crates.io/crates/parquet)
[![docs.rs](https://img.shields.io/docsrs/parquet.svg)](https://docs.rs/parquet/latest/parquet/)

This crate contains the official Native Rust implementation of [Apache Parquet](https://parquet.apache.org/), which is part of the [Apache Arrow](https://arrow.apache.org/) project.

See the [API documentation](https://docs.rs/parquet/latest) for examples and the full API.

The API documentation for most recent, unreleased code is available [here](https://arrow.apache.org/rust/parquet/index.html).

## Rust Version Compatibility

This crate is tested with the latest stable version of Rust. We do not currently test against other, older versions of the Rust compiler.

## Versioning / Releases

The `parquet` crate follows the [SemVer standard] defined by Cargo and works well
within the Rust crate ecosystem. See the [repository README] for more details on
the release schedule, version and deprecation policy.

[semver standard]: https://doc.rust-lang.org/cargo/reference/semver.html
[repository readme]: https://github.com/apache/arrow-rs

Note that for historical reasons, this crate uses versions with major numbers
greater than `0.x` (e.g. `19.0.0`), unlike many other crates in the Rust
ecosystem which spend extended time releasing versions `0.x` to signal planned
ongoing API changes. Minor arrow releases contain only compatible changes, while
major releases may contain breaking API changes.

## Feature Flags

The `parquet` crate provides the following features which may be enabled in your `Cargo.toml`:

- `arrow` (default) - support for reading / writing [`arrow`] arrays to / from Parquet
- `async` - support `async` APIs for reading Parquet
- `json` - support for reading / writing `json` data to / from Parquet
- `brotli` (default) - support for Parquet using `brotli` compression
- `flate2` (default) - support for Parquet using `gzip` compression
- `lz4` (default) - support for Parquet using `lz4` compression
- `zstd` (default) - support for Parquet using `zstd` compression
- `snap` (default) - support for Parquet using `snappy` compression
- `cli` - parquet [CLI tools](https://github.com/apache/arrow-rs/tree/main/parquet/src/bin)
- `crc` - enables functionality to automatically verify checksums of each page (if present) when decoding
- `experimental` - Experimental APIs which may change, even between minor releases
- `simdutf8` (default) - Use the [`simdutf8`] crate for SIMD-accelerated UTF-8 validation
- `encryption` - support for reading / writing encrypted Parquet files
- `variant_experimental` - ⚠️ Experimental [Parquet Variant] support, which may change, even between minor releases.
- `geospatial` - ⚠️ Experimental geospatial support, which may change, even between minor releases.

[`arrow`]: https://crates.io/crates/arrow
[`simdutf8`]: https://crates.io/crates/simdutf8
[parquet variant]: https://github.com/apache/parquet-format/blob/master/VariantEncoding.md

## Parquet Feature Status

Please see the [Implementation Status Page] on the [Apache Parquet] website for
information on the status of this implementation.

[implementation status page]: https://parquet.apache.org/docs/file-format/implementationstatus/

## License

Licensed under the Apache License, Version 2.0: <http://www.apache.org/licenses/LICENSE-2.0>.