Method next_id

datafusion/common/src/display/graphviz.rs:29–32

Generate next id in graphviz.

(&mut self)

impl GraphvizBuilder {
    // Generate next id in graphviz.
    pub fn next_id(&mut self) -> usize {
        self.id_gen += 1;
        self.id_gen
    }

    // Write out the start of whole graph.
    pub fn start_graph(&mut self, f: &mut fmt::Formatter) -> fmt::Result {