Enable Function Registry Failed to Work

[xinlifoobar]

Hi, while working on some prototype code to use arrow-udf with datafusion, even after several attempts, the code seems not to work. I want to request assistants to see what I missed. Thanks.

My Cargo.toml

arrow-udf = { version="0.3.0", features = ["global_registry"] }

#[function("eq(boolean, boolean) -> boolean")]
fn eq(lhs: bool, rhs: bool) -> bool {
    lhs == rhs
}

#[test]
fn test_eq() {
let bool_field = Field::new("", arrow::datatypes::DataType::Boolean, false);
let schema = Schema::new(vec![bool_field.clone()]);
let record_batch = RecordBatch::try_new(
    Arc::new(schema),
    vec![Arc::new(BooleanArray::from(vec![true, false, true]))],
)
.unwrap();

println!("Function signatures:");
REGISTRY.iter().for_each(|sig| {
    println!("{:?}", sig.name);
    println!("{:?}", sig.arg_types);
    println!("{:?}", sig.return_type);
});

let eval_eq_boolean = REGISTRY
    .get("eq", &[bool_field.clone(), bool_field.clone()], &bool_field)
    .unwrap()
    .function
    .as_scalar()
    .unwrap();

let result = eval_eq_boolean(&record_batch).unwrap();

assert!(result
    .column(0)
    .as_any()
    .downcast_ref::<BooleanArray>()
    .unwrap()
    .value(0));
}

Expected Behavior:

The code should print all functions in the registry and execute upon the record batch.

Actual behavior:

Output nothing and panic on unwrap.

Full code here: https://github.com/xinlifoobar/datafusion/pull/3/files#diff-80f6fc619b413359395ea967b66300724888683350eb23c1a9268ee095761903

[xinlifoobar]

I resolved this by adding an additional feature to the crate. I'm still curious about why we need to define this as a calling package...

global_registry = [
    "arrow-udf"
]