Enum AccessPathKind 

pub enum AccessPathKind {
    FullTableScan,
    IndexScanRange {
        selectivity: f64,
    },
    IndexScanEquality,
    CoveringIndexScan {
        selectivity: f64,
    },
    RowidLookup,
}

The kind of access path the planner can choose for a table scan.

Variants

FullTableScan

Sequential scan of all table pages.

IndexScanRange

Index range scan (e.g. col > expr, col BETWEEN).

Fields

selectivity: f64

IndexScanEquality

Index equality scan (e.g. col = expr).

CoveringIndexScan

Covering index scan (all needed columns are in the index).

Fields

selectivity: f64

RowidLookup

Direct rowid lookup (e.g. WHERE rowid = ?).

Trait Implementations

impl Clone for AccessPathKind

fn clone(&self) -> AccessPathKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AccessPathKind

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

Formats the value using the given formatter.

impl PartialEq for AccessPathKind

fn eq(&self, other: &AccessPathKind) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for AccessPathKind