Struct GraphvizVisitor 

struct GraphvizVisitor<'a, 'b> {
    f: &'a mut Formatter<'b>,
    t: DisplayFormatType,
    show_metrics: ShowMetrics,
    show_statistics: bool,
    metric_types: &'a [MetricType],
    graphviz_builder: GraphvizBuilder,
    parents: Vec<usize>,
}

Fields

f: &'a mut Formatter<'b>

t: DisplayFormatType

How to format each node

show_metrics: ShowMetrics

How to show metrics

show_statistics: bool

If statistics should be displayed

metric_types: &'a [MetricType]

Which metric types should be rendered

graphviz_builder: GraphvizBuilder

parents: Vec<usize>

Used to record parent node ids when visiting a plan.

Implementations

impl GraphvizVisitor<'_, '_>

fn start_graph(&mut self) -> Result

fn end_graph(&mut self) -> Result

Trait Implementations

impl ExecutionPlanVisitor for GraphvizVisitor<'_, '_>

type Error = Error

The type of error returned by this visitor

fn pre_visit(&mut self, plan: &dyn ExecutionPlan) -> Result<bool, Self::Error>

Invoked on an ExecutionPlan plan before any of its child inputs have been visited. If Ok(true) is returned, the recursion continues. If Err(..) or Ok(false) are returned, the recursion stops immediately and the error, if any, is returned to accept

fn post_visit(&mut self, _plan: &dyn ExecutionPlan) -> Result<bool, Self::Error>

Invoked on an ExecutionPlan plan after all of its child inputs have been visited. The return value is handled the same as the return value of pre_visit. The provided default implementation returns Ok(true).