Enum Column 

pub enum Column {
    I8(Arc<[i8]>),
    U8(Arc<[u8]>),
    I16(Arc<[i16]>),
    U16(Arc<[u16]>),
    I32(Arc<[i32]>),
    U32(Arc<[u32]>),
    I64(Arc<[i64]>),
    U64(Arc<[u64]>),
}

An immutable exact row-data column.

Unlike floating-point expression scalars, these values never pass through floating-point storage or runtime precision conversion.

Variants

I8(Arc<[i8]>)

An immutable int8 buffer.

U8(Arc<[u8]>)

An immutable uint8 buffer.

I16(Arc<[i16]>)

An immutable int16 buffer.

U16(Arc<[u16]>)

An immutable uint16 buffer.

I32(Arc<[i32]>)

An immutable int32 buffer.

U32(Arc<[u32]>)

An immutable uint32 buffer.

I64(Arc<[i64]>)

An immutable int64 buffer.

U64(Arc<[u64]>)

An immutable uint64 buffer.

Implementations

impl Column

pub fn dtype(&self) -> ColumnDType

Returns the exact storage dtype.

pub fn len(&self) -> usize

Returns the number of values.

pub fn at(&self, row: usize) -> ColumnValue

Returns one exact value.

Panics

Panics when row is outside the column.

pub fn append_le_bytes(&self, output: &mut Vec<u8>)

Appends exact little-endian values to a transport buffer.

pub fn from_le_bytes(dtype: ColumnDType, bytes: &[u8]) -> LadduDataResult<Self>

Decodes a buffer of exact little-endian values.

Errors

Returns an error if the byte count is not a multiple of the dtype width.

pub fn select(&self, rows: &[usize]) -> Self

Copies selected rows in the requested order.

Panics

Panics when a requested row is outside the column.

pub fn slice(&self, start: usize, end: usize) -> Self

Copies a half-open range of values.

Panics

Panics when the range is invalid.

impl Column

pub fn is_empty(&self) -> bool

Returns whether the column contains no values.

pub fn empty(dtype: ColumnDType) -> Self

Creates a correctly typed empty column.

pub fn concat(dtype: ColumnDType, columns: &[&Self]) -> LadduDataResult<Self>

Concatenates columns of one exact dtype.

Errors

Returns an error if any column has a different dtype.

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 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