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add notable project that are built with DataFusion to README #7061

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17 changes: 13 additions & 4 deletions README.md
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<img src="https://arrow.apache.org/datafusion/_images/DataFusion-Logo-Background-White.png" width="256" alt="logo"/>

DataFusion is a very fast, extensible query engine for building high-quality data-centric systems in
[Rust](http://rustlang.org), using the [Apache Arrow](https://arrow.apache.org)
in-memory format. [Python Bindings](https://github.com/apache/arrow-datafusion-python) are also available.
DataFusion is a very fast, extensible query engine for building high-quality data-centric systems in [Rust](http://rustlang.org), using the [Apache Arrow](https://arrow.apache.org) in-memory format. [Python Bindings](https://github.com/apache/arrow-datafusion-python) are also available.

DataFusion offers SQL and Dataframe APIs, excellent [performance](https://benchmark.clickhouse.com/), built-in support for CSV, Parquet, JSON, and Avro, extensive customization, and a great community.

https://arrow.apache.org/datafusion/ contains the project's documentation.
Here's are links to the documentation:

* [Rust API](https://arrow.apache.org/datafusion/user-guide/dataframe.html)
* [Python API](https://arrow.apache.org/datafusion-python/)

## Using DataFusion

The [example usage] section in the user guide and the [datafusion-examples] code in the crate contain information on using DataFusion.

## Notable projects that are build with DataFusion

DataFusion is great for building other data projects like SQL interfaces on query engines and time series platforms. Here are some of the large projects that are built with DataFusion:

* [roapi](https://github.com/roapi/roapi): Easily create APIs for slow moving datasets.
* [dask-sql](https://github.com/dask-contrib/dask-sql): SQL interface for Dask query engine.
* [influxdb_iox](https://github.com/influxdata/influxdb_iox): real-time analytics datastore.

## Contributing to DataFusion

The [developer’s guide] contains information on how to contribute.
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