Struct DatasetFacts 

pub struct DatasetFacts {
    pub mtime: u64,
    pub size: u64,
    pub rows: Option<usize>,
    pub cols: Option<usize>,
    pub cols_sampled: bool,
    pub columns: Vec<String>,
    pub kind: Option<EntryKind>,
    pub classified_by: u32,
    pub cost: Cost,
    pub holds: Holds,
}

What datui remembers about a measured dataset: a cache, not a catalog. Every field is re-derivable, and the recorded size and mtime invalidate a changed dataset.

Fields

mtime: u64

Modification time in seconds since the epoch, as a fingerprint.

size: u64

Size in bytes, the other half of the fingerprint.

rows: Option<usize>

cols: Option<usize>

cols_sampled: bool

Whether cols is a floor (a sampled large directory), restored with the count so a sample is never shown as a total.

columns: Vec<String>

Column names, enabling search by column before anything is read this run.

kind: Option<EntryKind>

What the dataset turned out to be: recorded since a remote path cannot be classified without reading, and a row should read the same in every section.

classified_by: u32

The build rules kind came from (see crate::home::discover::CLASSIFIER_VERSION); 0 in records older than this field.

cost: Cost

What opening costs (compression, layout, partitioning), from a footer read a remote dataset may not get twice.

holds: Holds

What one listing of the directory found (its label), restored beside kind under the same classifier version.

Trait Implementations

impl Clone for DatasetFacts

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 DatasetFacts

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

Formats the value using the given formatter.

impl Default for DatasetFacts

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DatasetFacts

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for DatasetFacts

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.