Skip to main content

LogicalCardinalityExt

risingwave_frontend::optimizer::plan_visitor::cardinality_visitor

Trait LogicalCardinalityExt 

Source 
pub trait LogicalCardinalityExt {
    // Required methods
    fn max_one_row(&self) -> bool;
    fn row_count(&self) -> Option<usize>;
}

Required Methods§

Source

fn max_one_row(&self) -> bool

Returns true if the plan node is guaranteed to yield at most one row.

Source

fn row_count(&self) -> Option<usize>

Returns the number of rows the plan node is guaranteed to yield, if known exactly.

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§