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# User Guide

Apache DataFusion Java is a thin Java binding over the
[Apache DataFusion](https://datafusion.apache.org/) query engine. SQL and
DataFrame queries execute in native Rust; results return to the JVM as
[Apache Arrow](https://arrow.apache.org/) record batches over the Arrow C
Data Interface.

This guide covers installation, the `SessionContext` and `DataFrame` APIs,
and Parquet ingestion.

```{toctree}
:maxdepth: 1

installation
quickstart
sessioncontext
dataframe
parquet
proto-plans
scalar-udf
table-provider
api-reference
```

> Early development: no releases yet, API will change. Bug reports and
> contributions welcome.
