Struct Step 

pub struct Step {
    pub name: String,
    pub kind: StepKind,
    pub projections: Vec<Expression>,
    pub dependencies: Vec<Step>,
    pub aggregations: Vec<Expression>,
    pub group_by: Vec<Expression>,
    pub condition: Option<Expression>,
    pub order_by: Vec<Expression>,
    pub limit: Option<Expression>,
}

A step in the execution plan

Fields

name: String

Name of this step

kind: StepKind

Type of step

projections: Vec<Expression>

Projections to output

dependencies: Vec<Step>

Dependencies (other steps that must complete first)

aggregations: Vec<Expression>

Aggregation expressions (for Aggregate steps)

group_by: Vec<Expression>

Group by expressions (for Aggregate steps)

condition: Option<Expression>

Join condition (for Join steps)

order_by: Vec<Expression>

Sort expressions (for Sort steps)

limit: Option<Expression>

Limit value (for Scan/other steps)

Implementations

impl Step

pub fn new(name: impl Into<String>, kind: StepKind) -> Self

Create a new step

pub fn from_expression( expression: &Expression, ctes: &HashMap<String, Step>, ) -> Option<Self>

Build a step from an expression

pub fn add_dependency(&mut self, dep: Step)

Add a dependency to this step

Trait Implementations

impl Clone for Step

fn clone(&self) -> Step

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Step

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.