Struct ColumnEnum8 

pub struct ColumnEnum8 { /* private fields */ }

Column for Enum8 type (stored as Int8 with name-value mapping in Type).

Implementations

impl ColumnEnum8

pub fn new(type_: Type) -> Self

Create a new empty Enum8 column.

Panics

Panics if type_ is not Type::Enum8.

pub fn with_data(self, data: Vec<i8>) -> Self

Set the column data from a vector of raw i8 enum values.

pub fn append_value(&mut self, value: i8)

Append enum by numeric value

pub fn append_name(&mut self, name: &str) -> Result<()>

Append enum by name (looks up value in Type).

Errors

Returns an error if name is not a known variant in this enum type.

pub fn at(&self, index: usize) -> i8

Get numeric value at index.

pub fn name_at(&self, index: usize) -> Option<&str>

Get enum name at index (looks up in Type).

pub fn len(&self) -> usize

Returns the number of values in this column.

pub fn is_empty(&self) -> bool

Returns true if the column contains no values.

Trait Implementations

impl Column for ColumnEnum8

fn column_type(&self) -> &Type

Get the type of this column

fn size(&self) -> usize

Get the number of rows in this column

fn clear(&mut self)

Clear all data from the column

fn reserve(&mut self, new_cap: usize)

Reserve capacity for at least new_cap elements

fn append_column(&mut self, other: ColumnRef) -> Result<()>

Append another column’s data to this column

fn load_from_buffer(&mut self, buffer: &mut &[u8], rows: usize) -> Result<()>

Load column data from byte buffer

fn save_to_buffer(&self, buffer: &mut BytesMut) -> Result<()>

Save column data to byte buffer

fn clone_empty(&self) -> ColumnRef

Create an empty clone of this column (same type, no data)

fn slice(&self, begin: usize, len: usize) -> Result<ColumnRef>

Create a slice of this column

fn as_any(&self) -> &dyn Any

Downcast to a concrete column type

fn as_any_mut(&mut self) -> &mut dyn Any

Downcast to a mutable concrete column type

fn load_prefix(&mut self, _buffer: &mut &[u8], _rows: usize) -> Result<()>

Load column prefix from byte buffer (for types that need prefix data) Default implementation is a no-op. Override for types like LowCardinality. This matches C++ clickhouse-cpp’s LoadPrefix pattern.

fn save_prefix(&self, _buffer: &mut BytesMut) -> Result<()>

Save column prefix to byte buffer (for types that need prefix data) Default implementation is a no-op. Override for types like LowCardinality, Array with special nested types. This matches C++ clickhouse-cpp’s SavePrefix pattern.