Hi, Quick question: is UDF/UDAF working in Ballista? I saw "TODO" in the executor part :
```rust // TODO add logic to dynamically load UDF/UDAFs libs from files scalar_functions: HashMap::new(), aggregate_functions: HashMap::new(), ``` To create an example library and add reading functionality here looks "simple enough", however I don't know how this would possibly work with client/ scheduler - resolving logical plan and then logical to physical. Not to mention how that will be passed through grpc? I feel confused. For " hack version" - should I register the udf library in all client/scheduler/executors? Will appreciate any help / pointers - learning is fun ;-) Cheers, Jaro
