Struct datafusion_expr::logical_plan::display::IndentVisitor

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

Formats plans with a single line per node. For example:

Projection: id Filter: state Eq Utf8("CO")
CsvScan: employee.csv projection=Some([0, 3])“;

Implementations

impl<'a, 'b> IndentVisitor<'a, 'b>

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

Create a visitor that will write a formatted LogicalPlan to f. If with_schema is true, includes schema information on each line.

Trait Implementations

impl<'a, 'b> PlanVisitor for IndentVisitor<'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).