Closed
Description
Is your feature request related to a problem or challenge?
Part of #7014
If we want to have DataFusion used as the core of many new systems, we need it to be as easy as possible for someone to get their idea working on top of DataFusion.
Thanks to @tshauck we now have a basic Library Users Guide ❤️ and this ticket describes expanding it out
Describe the solution you'd like
Fill in the content of https://arrow.apache.org/datafusion/library-user-guide/adding-udfs.html
Example Outline
- How to create and register a
ScalarUDF
- How to create and register a
AggregateUDF
- How to create and register a
WindowUDF
The examples directory holds a bunch more of examples: https://github.com/apache/arrow-datafusion/tree/main/datafusion-examples
Describe alternatives you've considered
No response
Additional context
No response