Struct ColumnFixedString 

pub struct ColumnFixedString { /* private fields */ }

Column for fixed-length strings (all strings padded to same length)

Stores binary data of exactly N bytes per element, zero-padded if needed.

ClickHouse Reference: https://clickhouse.com/docs/en/sql-reference/data-types/fixedstring

Implementations

impl ColumnFixedString

pub fn new(type_: Type) -> Self

Creates a new empty FixedString column, extracting the fixed size from the type.

pub fn with_capacity(type_: Type, capacity: usize) -> Self

Creates a new empty FixedString column with pre-allocated capacity for the given number of elements.

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

Create a column with initial data (builder pattern)

pub fn append(&mut self, s: String)

Appends a string value, zero-padding it to the fixed size.

pub fn get(&self, index: usize) -> Option<String>

Returns the string at the given index, or None if out of bounds.

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

Get value at index (for tests)

pub fn len(&self) -> usize

Get the number of elements (alias for size())

pub fn is_empty(&self) -> bool

Check if the column is empty

pub fn fixed_size(&self) -> usize

Returns the fixed byte size of each element in the column.

Trait Implementations

impl Column for ColumnFixedString

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.