Struct Cost 

pub struct Cost {
    pub took: Duration,
    pub files: Option<usize>,
    pub over_the_wire: Option<OverTheWire>,
}

One stretch of work, and what it cost.

Fields

took: Duration

How long it took, from the first request to the last answer.

files: Option<usize>

The data files found, or the footers read — None where the stretch did the work without ever learning a count.

Every route that reaches a user today knows its count. The one that does not is the walk to a prefix’s two ends, which never lists what lies between them; that route cannot currently be reached (see schema_from_one_cloud_hive), and this is what keeps it from reporting the two ends as the size of the dataset if it ever is.

over_the_wire: Option<OverTheWire>

Requests datui made itself and can count, with the bytes they returned.

None on every listing, and not only the local ones: a directory is read rather than requested, and a remote prefix is one call whose round trips happen inside the object store, which does not say how many there were. A figure of zero would read as “no data moved” rather than “not measured here”.

Trait Implementations

impl Clone for Cost

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 Cost

impl Debug for Cost

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

Formats the value using the given formatter.

impl Eq for Cost

impl PartialEq for Cost

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Cost