Enum Capacities

pub enum Capacities {
    Binary(usize, Option<usize>),
    List(usize, Option<Box<Capacities>>),
    Struct(usize, Option<Vec<Capacities>>),
    Dictionary(usize, Option<Box<Capacities>>),
    Array(usize),
}

Define capacities to pre-allocate for child data or data buffers.

Variants

Binary(usize, Option<usize>)

Binary, Utf8 and LargeUtf8 data types

Defines

• the capacity of the array offsets
• the capacity of the binary/ str buffer

List(usize, Option<Box<Capacities>>)

List and LargeList data types

Defines

• the capacity of the array offsets
• the capacity of the child data

Struct(usize, Option<Vec<Capacities>>)

Struct type

Defines

• the capacity of the array
• the capacities of the fields

Dictionary(usize, Option<Box<Capacities>>)

Dictionary type

Defines

• the capacity of the array/keys
• the capacity of the values

Array(usize)

Don’t preallocate inner buffers and rely on array growth strategy

Trait Implementations

impl Clone for Capacities

fn clone(&self) -> Capacities

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Capacities

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

Formats the value using the given formatter.