deuterium 0.3.2

Deuterium is a fancy SQL builder for Rust. It's designed to provide a DSL to easily build SQL queries in safe and *typed* way.
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use super::expression;

#[derive(Clone)]
pub struct Distinct {
    on: Option<Vec<expression::SharedExpression>>
}

impl Distinct {
    pub fn new() -> Distinct {
        Distinct { on: None }
    }

    pub fn get_on(&self) -> &Option<Vec<expression::SharedExpression>> { &self.on }

    pub fn on(fields: &[&expression::UntypedExpression]) -> Distinct {
        Distinct { on: Some( 
            fields.iter().map(|f| f.upcast_expression()).collect() 
        )}
    }
}