Can we add `udtf` to `FunctionRegistry`?
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Description
### Discussed in https://github.com/apache/datafusion/discussions/14571
Originally posted by **niebayes** February 10, 2025
The `FunctionRegistry` provides interfaces for accessing user defined functions, aggregate functions, window functions ,etc.
But it lacks of an interface for accessing registered table functions.
Can we add a `udtf` method to `FunctionRegistry`?
Contributor guide
Research direction
Start by locating the Rust FunctionRegistry definition and reviewing its existing interfaces for user-defined, aggregate, and window functions. Determine how registered table functions are represented and exposed, then verify that the registry provides the requested table-function access and that relevant tests cover it.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- api
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100