Struct Built 

pub struct Built {
    pub column: usize,
    pub form: Form,
    pub rows: u64,
    pub distinct: bool,
    pub bytes: usize,
    pub column_bytes: u64,
    pub built: bool,
    pub build: Duration,
}

What building one key map cost and what it bought.

G1’s exit measurement in spec/graph/10-milestones.md wants build time and bytes reported per table, so the build reports them rather than being timed from outside. The form is here because it is the number that explains the bytes: an identity map over fifteen million rows is the same size as one over five.

Fields

column: usize

Which column was mapped.

form: Form

Which of the three forms the measurement chose.

rows: u64

Non-null keys in the column.

distinct: bool

Whether every key was distinct, which is section 2.3’s verification and decides whether a link may be built on this column at all.

bytes: usize

What the map takes in the file, header included, or would have taken when it was not kept.

column_bytes: u64

What the column it maps takes in the file, which is what the budget is a share of.

built: bool

Whether the map was kept. False means it was built, measured, and found to cost more than section 3.7 allows, so the file does not have it and the query plans as though key maps had never been implemented.

build: Duration

How long the build took, the reading of the column included.

Trait Implementations

impl Clone for Built

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Built

impl Debug for Built

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

Formats the value using the given formatter.