Is your feature request related to a problem or challenge?

I would like to write a blog that explains how to use DataFusion and external indexes when reading parquet files

We have some existing example which I think shows how to make them work, lacks sufficient context I think for a wider audience

https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/advanced_parquet_index.rs
https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/parquet_index.rs

Describe the solution you'd like

I recently did a talk ( video and presentation) where I explained a lot of this, which I think can be turned into a blog pretty reasonably

Describe alternatives you've considered

No response

Additional context

fyi @zhuqi-lucas and @JigaoLuo may also be interested