rayforce 1.3.1

Convenient, high-performance Rust bindings for RayforceDB v2
Documentation 
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//! Lambda functions (`Fn`) — direct calls, query application, introspection.

use rayforce::{col, sum, Fn, Runtime, Table, Value};

#[test]
fn direct_call_scalar() {
    Runtime::scope(|_rt| {
        let square = Fn::new("(fn [x] (* x x))").unwrap();
        assert_eq!(square.call(&[Value::i64(5)]).unwrap().as_i64().unwrap(), 25);
        assert_eq!(
            square.call(&[Value::i64(10)]).unwrap().as_i64().unwrap(),
            100
        );
        Ok(())
    })
    .unwrap();
}

#[test]
fn accepts_whitespace_after_lambda_open_paren() {
    Runtime::scope(|_rt| {
        let square = Fn::new("( fn [x] (* x x))").unwrap();
        assert_eq!(square.call(&[Value::i64(6)]).unwrap().as_i64().unwrap(), 36);
        Ok(())
    })
    .unwrap();
}

#[test]
fn direct_call_multiple_args() {
    Runtime::scope(|_rt| {
        let add = Fn::new("(fn [x y] (+ x y))").unwrap();
        assert_eq!(
            add.call(&[Value::i64(5), Value::i64(3)])
                .unwrap()
                .as_i64()
                .unwrap(),
            8
        );
        Ok(())
    })
    .unwrap();
}

#[test]
fn call_over_vector() {
    Runtime::scope(|_rt| {
        let square = Fn::new("(fn [x] (* x x))").unwrap();
        let r = square.call(&[Value::vec(&[2i64, 3, 4])]).unwrap();
        assert_eq!(r.as_slice::<i64>().unwrap(), &[4, 9, 16]);
        Ok(())
    })
    .unwrap();
}

#[test]
fn rejects_non_fn_source() {
    Runtime::scope(|_rt| {
        assert!(Fn::new("(+ 1 2)").is_err());
        Ok(())
    })
    .unwrap();
}

#[test]
fn apply_in_select() {
    Runtime::scope(|_rt| {
        let table = Table::new(
            &["id", "value"],
            &[Value::sym_vec(&["a", "b", "c"]), Value::vec(&[2i64, 3, 4])],
        )
        .unwrap();

        let square = Fn::new("(fn [x] (* x x))").unwrap();
        let out = table
            .select()
            .col("id")
            .agg("squared", square.apply([col("value")]).unwrap())
            .execute()
            .unwrap();

        let squared = out.column("squared").unwrap();
        assert_eq!(squared.as_slice::<i64>().unwrap(), &[4, 9, 16]);
        Ok(())
    })
    .unwrap();
}

#[test]
fn apply_with_aggregation() {
    Runtime::scope(|_rt| {
        let table = Table::new(
            &["id", "value"],
            &[
                Value::sym_vec(&["a", "b", "c", "d"]),
                Value::vec(&[2i64, 3, 4, 5]),
            ],
        )
        .unwrap();

        let square = Fn::new("(fn [x] (* x x))").unwrap();
        let out = table
            .select()
            .agg("sum_sq", sum(square.apply([col("value")]).unwrap()))
            .execute()
            .unwrap();

        // 4 + 9 + 16 + 25 = 54
        assert_eq!(
            out.column("sum_sq")
                .unwrap()
                .get(0)
                .unwrap()
                .as_i64()
                .unwrap(),
            54
        );
        Ok(())
    })
    .unwrap();
}

#[test]
fn introspection() {
    Runtime::scope(|_rt| {
        let square = Fn::new("(fn [x] (* x x))").unwrap();
        assert_eq!(square.source(), Some("(fn [x] (* x x))"));
        assert_eq!(format!("{square}"), "(fn [x] (* x x))");
        // `meta` reflects whatever the engine reports for the lambda.
        assert!(square.meta().is_ok());
        Ok(())
    })
    .unwrap();
}