Struct Column 

pub struct Column<'b> { /* private fields */ }

Borrowed view of a block column.

Implementations

impl<'b> Column<'b>

pub fn layout(&self) -> Option<ColumnLayout>

pub fn n_rows(&self) -> usize

pub fn validate(&self) -> Result<()>

Validates array offsets and LowCardinality dictionary indexes.

Validation includes nested columns and returns ErrorKind::Protocol for invalid data.

pub fn fixed(&self) -> Option<(usize, &'b [u8])>

Returns element width and little-endian data for a fixed-width column.

pub fn string(&self) -> Option<(&'b [u64], &'b [u8])>

Returns offsets and bytes for a string column.

Each offset is exclusive end of corresponding row in host byte order. Layout also represents string-encoded JSON and LowCardinality dictionaries.

pub fn null_map(&self) -> Option<&'b [u8]>

pub fn nullable_inner(&self) -> Option<Column<'b>>

pub fn array_offsets(&self) -> Option<&'b [u64]>

pub fn array_values(&self) -> Option<Column<'b>>

pub fn tuple_arity(&self) -> usize

pub fn tuple_child(&self, i: usize) -> Option<Column<'b>>

pub fn low_cardinality(&self) -> Option<LowCardinalityView<'b>>

Returns keys and dictionary for a LowCardinality column.

Trait Implementations

impl<'b> Clone for Column<'b>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'b> Copy for Column<'b>