Macro table_function

macro_rules! table_function {
    ($struct_name:ident::$function_name:ident($($arg_ty:expr),*) -> [$($output_name:ident: $output_ty:expr),*] => $closure:expr) => { ... };
}

Examples

table_function!(MyTableFunction::test_numbers(LogicalType::Integer) -> [c1: LogicalType::Integer, c2: LogicalType::Integer] => (|v1: DataValue| {
    let num = v1.i32().unwrap();

    Ok(Box::new((0..num)
        .into_iter()
        .map(|i| Ok(Tuple {
            id: None,
            values: vec![
                DataValue::Int32(Some(i)),
                DataValue::Int32(Some(i)),
            ]
        }))) as Box<dyn Iterator<Item = Result<Tuple, DatabaseError>>>)
    }));

    let fnck_sql = DataBaseBuilder::path("./example")
        .register_table_function(MyTableFunction::new())
        .build()
    ?;