Enum VecEncoding 

pub enum VecEncoding {
    F32,
    Sq8,
    F16,
}

In-cell encoding for a VECTOR(N) column. v6.0.1 added the optional USING <encoding> clause; omitting it keeps the pre-v6 F32 default. Sq8 quantises each cell to a per-vector affine (min, max, [u8; dim]) triple (4× compression). F16 (v6.0.3, DDL keyword HALF) stores each element as IEEE-754 binary16 (2× compression, ~3 decimal digits of precision).

Variants

F32

IEEE-754 binary32. Pre-v6 default; matches pgvector’s uncompressed vector type wire / storage layout.

Sq8

v6.0.1 SQ8 — per-vector affine 8-bit quantisation. See spg_storage::quantize::Sq8Vector for the math + recall envelope (≥ 0.95 on Gaussian / unit-sphere corpora at dim ≥ 32).

F16

v6.0.3 halfvec — IEEE-754 binary16 (half-precision) per-element. DDL keyword HALF (pgvector convention). Bit-exact dequantise to f32 at the storage layer; no rerank pass needed for kNN search.

Trait Implementations

impl Clone for VecEncoding

fn clone(&self) -> VecEncoding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for VecEncoding

impl Debug for VecEncoding

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

Formats the value using the given formatter.

impl Default for VecEncoding

fn default() -> VecEncoding

Returns the “default value” for a type.

impl Display for VecEncoding

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

Formats the value using the given formatter.

impl Eq for VecEncoding

impl PartialEq for VecEncoding

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for VecEncoding