Struct BlockMeta 

pub struct BlockMeta {
    pub last_docid: u32,
    pub docids_offset: u32,
    pub tfs_offset: u32,
    pub positions_offset: u32,
    pub positions_count: u32,
    pub count: u16,
    pub docid_bits: u8,
    pub tf_bits: u8,
    pub position_bits: u8,
    pub block_max: u8,
    pub max_tf: u32,
    pub min_len: u16,
}

One block’s metadata row, exactly BLOCK_META_LEN bytes on disk.

Fields

last_docid: u32

Largest document id in the block; the skip key.

docids_offset: u32

Byte offset of the block’s packed docid deltas.

tfs_offset: u32

Byte offset of the block’s packed term frequencies.

positions_offset: u32

Byte offset of the block’s packed positions.

positions_count: u32

Packed positions in the block.

count: u16

Postings in the block; the final block may be partial.

docid_bits: u8

Bit width of the docid deltas.

tf_bits: u8

Bit width of the term frequencies.

position_bits: u8

Bit width of the position deltas.

block_max: u8

Reserved for a caller-supplied impact. Written zero by this engine.

Version 1 stored quantize(score / ceiling) here and computed the pruning bound from it. That was unsound: the quotient bakes in seal-time avgdl and seal-time (k1, b), neither of which cancels, so the stored bound fell below a true score once statistics drifted. The slot is kept — its shape suits a caller-supplied learned impact — but nothing in the engine reads it for a bound.

max_tf: u32

Largest term frequency in the block. Zero in a version 1 stream.

min_len: u16

Smallest document length in the block, saturating DOWN to u16::MAX.

Down, because a shorter document scores higher: saturating upward would put the stored bound below a true score.

Implementations

impl BlockMeta

pub fn read(input: &[u8]) -> Result<Self, PostingsError>

Reads one metadata row from the front of input.

Errors

Returns PostingsError::Truncated when fewer than BLOCK_META_LEN bytes are available.

Trait Implementations

impl Clone for BlockMeta

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for BlockMeta

impl Debug for BlockMeta

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

Formats the value using the given formatter.

impl Default for BlockMeta

fn default() -> Self

Returns the “default value” for a type.

impl Eq for BlockMeta

impl PartialEq for BlockMeta

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BlockMeta