Struct Column 

pub struct Column { /* private fields */ }

A read-only dense column.

Implementations

impl Column

pub fn pack<'a>( count: u32, records: impl IntoIterator<Item = (Ordinal, &'a [u8])>, ) -> Vec<u8>

The column records pack, in ordinal order.

A record is placed at its ordinal, and an ordinal no record names gets an empty range.

pub fn read(bytes: &[u8]) -> Result<Self, ColumnError>

Reads a packed column, checking its offsets once so a read never can.

Errors

Returns ColumnError when the bytes are shorter than the header declares or an offset lies outside the records.

pub fn len(&self) -> usize

How many ordinals the column holds.

pub fn is_empty(&self) -> bool

Whether the column holds no ordinals.

pub fn get(&self, ordinal: Ordinal) -> Option<&[u8]>

The record at ordinal, None beyond the column or where the build wrote none.

The offsets were checked when the column was read, so this slices without failing.

Trait Implementations

impl Clone for Column

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 Column

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

Formats the value using the given formatter.

impl Default for Column

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Column

impl PartialEq for Column

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Column