Struct RowLayout 

pub struct RowLayout { /* private fields */ }

Describes the layout of a row for use with a row collection.

Row layout: [validity_bytes, row_encoded_values]

The validity bytes are just a bitmap padded out to the nearest byte which each bit indicating the corresponding value’s validity.

The row encoded values are just unaligned writes of the value. Varlen data will have a fixed sized prefix/marker written inline, while the rest is written to a heap block somewhere.

Row encoding has no comparison properties.

Implementations

impl RowLayout

pub fn try_new(types: impl IntoIterator<Item = DataType>) -> Result<Self>

pub fn num_columns(&self) -> usize

pub const fn buffer_size(&self, rows: usize) -> usize

Returns the buffer size needed to store rows in the encoded row format.

This includes the width of each value in a row alongside the bytes needed for the validity mask;

pub fn byte_offset(&self, row: usize, column: usize) -> usize

Compute the byte offset needed to get a pointer to the colum in the given row.

pub fn compute_heap_sizes<A>( &self, arrays: &[A], rows: impl IntoExactSizeIterator<Item = usize> + Clone, sizes: &mut [usize], ) -> Result<()>

where A: Borrow<Array>,

Computes the heap sizes needed for each row.

All arrays should be provided so that it matches this row layout.

sizes will initially be set to all zeros.

Trait Implementations

impl Clone for RowLayout

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 RowLayout

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

Formats the value using the given formatter.

impl Eq for RowLayout

impl PartialEq for RowLayout

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RowLayout