Struct Measured 

pub struct Measured {
    pub rows: Option<usize>,
    pub cols: Option<usize>,
    pub cols_sampled: bool,
    pub size: Option<u64>,
    pub columns: Vec<String>,
    pub cost: Cost,
    pub kind: Option<EntryKind>,
    pub holds: Holds,
}

What measuring a dataset yielded: rows, columns, and total size, each absent when it cannot be known without reading the data.

Fields

rows: Option<usize>

cols: Option<usize>

cols_sampled: bool

Whether cols is a floor rather than a total. See crate::discover::Entry.

size: Option<u64>

columns: Vec<String>

Column names, when the format gave them up for free.

cost: Cost

What opening it costs: compression, layout, partitioning.

Carried here for the same reason the row count is. Without it, everything a footer said beyond rows and cols was read, recorded in the cache, and then dropped on the way to the screen – so a hive dataset measured the ordinary way showed no partitions, and a compressed file no codec.

kind: Option<EntryKind>

What the footers said it is, when that differs from what its filenames suggested: a directory whose files turn out to be separate tables is a plain directory, not a dataset. None when measuring did not change what it is, which is the ordinary case. See crate::discover::enrich.

holds: Holds

What one listing of it found, which is what the row’s label says. Carried for the same reason cost is: the classify pass is the only thing that counts a local directory, and a count that stops here never reaches the screen.

Trait Implementations

impl Clone for Measured

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Measured

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

Formats the value using the given formatter.

impl Default for Measured

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for Measured

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Measured