Struct CountsMatrix 

pub struct CountsMatrix { /* private fields */ }

Cumulative per-destination row counts at every block boundary.

Row b of the grid holds, for each destination label d, the number of source rows labeled d in blocks 0..=b. The final row therefore holds the total row count of every destination. Deleted (NULL-labeled) rows are not counted; the deleted count of a block is implied by block length - sum of per-label deltas.

Implementations

impl CountsMatrix

pub fn num_destinations(&self) -> u32

pub fn block_rows(&self) -> u32

pub fn total_rows(&self) -> u64

pub fn num_blocks(&self) -> usize

pub fn block_of(&self, row: u64) -> usize

The block containing physical source row row.

pub fn block_range(&self, block: usize) -> Range<u64>

The physical source row range covered by block.

pub fn count_before(&self, block: usize, label: u16) -> u32

Rows labeled label in blocks before block: the destination offset of the first label-row inside block.

pub fn counters_at_block(&self, block: usize) -> Vec<u32>

Per-label counters at the start of block, seeding a SweepTranslator.

pub fn total(&self, label: u16) -> u32

Total rows of destination label; the final cumulative row.

pub fn total_live_rows(&self) -> u64

Total live (labeled) rows across all destinations.

pub fn deleted_through(&self, block: usize) -> u64

Deleted (NULL-labeled) rows in blocks 0..=block.

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

Check internal consistency: per-label counts must be non-decreasing across blocks and each block’s live rows must fit its row range. O(num_blocks * num_destinations), no label IO. Called when a row map is opened, so a corrupt counts buffer fails loudly instead of translating rows to wrong addresses.

pub fn encode(&self) -> Vec<u8>

Serialize to the on-disk form stored in the row map file’s global buffer: a fixed header naming the representation, then the cumulative counts as little-endian u32.

pub fn decode(buf: &[u8]) -> Result<Self>

Decode the on-disk form, checking structure exactly: magic, version, a supported representation, shape legality and precise payload length. Content invariants (monotone counts, per-block row budgets) are checked by Self::validate.

Trait Implementations

impl Clone for CountsMatrix

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 CountsMatrix

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

Formats the value using the given formatter.

impl DeepSizeOf for CountsMatrix

fn deep_size_of_children(&self, _: &mut Context) -> usize

fn deep_size_of(&self) -> usize

impl Eq for CountsMatrix

impl PartialEq for CountsMatrix

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CountsMatrix