Macro fnck_sql::function

source ·

macro_rules! function {
    ($struct_name:ident::$function_name:ident($($arg_ty:expr),*) -> $return_ty:expr => $closure:expr) => { ... };
}

Expand description

§Examples

function!(MyFunction::sum(LogicalType::Integer, LogicalType::Integer) -> LogicalType::Integer => |v1: ValueRef, v2: ValueRef| {
    DataValue::binary_op(&v1, &v2, &BinaryOperator::Plus)
});

let fnck_sql = DataBaseBuilder::path("./example")
    .register_function(TestFunction::new())
    .build()
    .await?;