Enum SqpPlanStep 

pub enum SqpPlanStep {
    SeqScan {
        table: String,
        filter_count: usize,
    },
    IndexScan {
        index_id: SqpIndexId,
        selectivity: f64,
    },
    Filter(SqpPredicate),
    Sort {
        field: String,
        asc: bool,
    },
    Limit(usize),
    Project(Vec<String>),
}

A single step in a SqpQueryPlan.

Variants

SeqScan

Full sequential scan of the given table.

Fields

table: String

filter_count: usize

Number of predicate filters applied during the scan.

IndexScan

Index-based point or range lookup.

Fields

index_id: SqpIndexId

selectivity: f64

Fraction of rows the index is expected to match (0.0–1.0).

Filter(SqpPredicate)

Post-scan predicate filter.

Sort

Sort the result stream.

Fields

field: String

asc: bool

Limit(usize)

Truncate the result to at most N rows.

Project(Vec<String>)

Project (select) specific columns.

Trait Implementations

impl Clone for SqpPlanStep

fn clone(&self) -> SqpPlanStep

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SqpPlanStep

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

Formats the value using the given formatter.

impl Display for SqpPlanStep

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

Formats the value using the given formatter.