Struct datafusion_expr::logical_plan::display::GraphvizVisitor

pub struct GraphvizVisitor<'a, 'b> { /* private fields */ }

Formats plans for graphical display using the DOT language. This format can be visualized using software from graphviz

Implementations

impl<'a, 'b> GraphvizVisitor<'a, 'b>

pub fn new(f: &'a mut Formatter<'b>) -> Self

pub fn set_with_schema(&mut self, with_schema: bool)

Sets a flag which controls if the output schema is displayed

pub fn pre_visit_plan(&mut self, label: &str) -> Result

pub fn post_visit_plan(&mut self) -> Result

Trait Implementations

impl<'a, 'b> PlanVisitor for GraphvizVisitor<'a, 'b>

type Error = Error

The type of error returned by this visitor

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

Invoked on a logical 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: &LogicalPlan) -> Result<bool, Error>

Invoked on a logical 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).