Enum QueryPlan 

pub enum QueryPlan {
    TableScan {
        table: String,
        columns: Vec<String>,
        predicate: Option<Box<QueryPlan>>,
    },
    IndexSeek {
        index: String,
        key_range: KeyRange,
    },
    Filter {
        input: Box<QueryPlan>,
        predicate: Predicate,
    },
    Project {
        input: Box<QueryPlan>,
        columns: Vec<String>,
    },
    Sort {
        input: Box<QueryPlan>,
        order_by: Vec<(String, bool)>,
    },
    Limit {
        input: Box<QueryPlan>,
        count: usize,
        offset: usize,
    },
    Empty,
}

Query plan operators

Variants

TableScan

Full table scan

Fields

table: String

columns: Vec<String>

predicate: Option<Box<QueryPlan>>

IndexSeek

Index seek (primary or secondary)

Fields

index: String

key_range: KeyRange

Filter

Filter rows

Fields

input: Box<QueryPlan>

predicate: Predicate

Project

Project columns

Fields

input: Box<QueryPlan>

columns: Vec<String>

Sort

Sort results

Fields

input: Box<QueryPlan>

order_by: Vec<(String, bool)>

Limit

Limit results

Fields

input: Box<QueryPlan>

count: usize

offset: usize

Empty

Empty result

Trait Implementations

impl Clone for QueryPlan

fn clone(&self) -> QueryPlan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryPlan

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

Formats the value using the given formatter.