Enum ColumnEncoding 

pub enum ColumnEncoding {
    Plain,
    Auto,
}

How a columnar table’s column pages store their values.

A read hands a column out in its own layout. A page stored that way is handed out as a view of itself; any other encoding is built back into the layout by the read that wants the column whole, which costs time on every read of a warm page and saves bytes on the ones that come from disk. A level whose tables are read often wants Plain; a level whose tables are mostly stored wants Auto, as it wants a stronger compression.

Variants

Plain

Every page in its column’s own layout.

Auto

Each page as the expression over light operators (constant, runs, dictionary, bit packing, deltas) that costs least to store and to read, which is the plain layout when nothing beats it.

Trait Implementations

impl Clone for ColumnEncoding

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 ColumnEncoding

impl Debug for ColumnEncoding

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

Formats the value using the given formatter.

impl Default for ColumnEncoding

fn default() -> Self

Returns the “default value” for a type.

impl Eq for ColumnEncoding

impl PartialEq for ColumnEncoding

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ColumnEncoding