Struct RelationalAccessCostContext 

pub struct RelationalAccessCostContext { /* private fields */ }

Immutable structural work for the row source of one relation.

The default retains descriptor-only logical costing. A snapshot context must come from the exact pinned reader used by execution, rather than a global storage mode or cache counter. Counts describe logical lookup work; they do not certify cache warmth or predict physical I/O or elapsed time.

Implementations

impl RelationalAccessCostContext

pub const fn for_snapshot_rows( table_rows: NonZero<u64>, table_pages: NonZero<u64>, ) -> RelationalAccessCostContext

Records bounded table metadata from a caller-pinned row snapshot. Empty or unavailable row roots retain the default context. Mixed row sources require one context per relation, including inside join memos.

Trait Implementations

impl Clone for RelationalAccessCostContext

fn clone(&self) -> RelationalAccessCostContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RelationalAccessCostContext

impl Debug for RelationalAccessCostContext

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

Formats the value using the given formatter.

impl Default for RelationalAccessCostContext

fn default() -> RelationalAccessCostContext

Returns the “default value” for a type.

impl Eq for RelationalAccessCostContext

impl PartialEq for RelationalAccessCostContext

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RelationalAccessCostContext