vortex-data / vortex / 16970635821

pub fn reduce_operator(operator: Arc<dyn Operator>) -> VortexResult<Arc<dyn Operator>> {

    let operator = reduce_up(operator.clone())?;

    reduce_down(operator)

}

pub fn reduce_up(operator: Arc<dyn Operator>) -> VortexResult<Arc<dyn Operator>> {

    let mut folder = UpReducer;

    operator.fold(&mut folder).map(|t| t.value())

}

pub fn reduce_down(operator: Arc<dyn Operator>) -> VortexResult<Arc<dyn Operator>> {

    let mut rewriter = DownReducer;

    operator.rewrite(&mut rewriter).map(|t| t.value)

}

    fn visit_up(

        &mut self,

        node: Self::NodeTy,

        children: Vec<Self::Result>,

    ) -> VortexResult<FoldUp<Self::Result>> {

            match node.reduce_children(children.as_slice()) {

                None => node.with_children(children),

                Some(r) => r,

    }

    fn visit_down(&mut self, node: Self::NodeTy) -> VortexResult<Transformed<Self::NodeTy>> {

        if node.children_count() != 1 {

            return Ok(Transformed::no(node));

        }

        match node.children()[0].reduce_parent(node.clone()) {

            None => Ok(Transformed::no(node)),

            Some(r) => Ok(Transformed::yes(r)),

    }