Struct IndexMeta 

pub struct IndexMeta {
    pub dim: usize,
    pub bit_width: u8,
    pub model_id: Option<String>,
    pub prefix_policy: Option<String>,
    pub schema_version: Option<u32>,
}

Persisted vector-index metadata sidecar.

Stored as vectors.meta.json next to the index file. Consumers compare these on load to decide whether a rebuild is needed (e.g. a prefix-policy change with the same dim).

Fields

dim: usize

Embedding dimensionality (must match the model).

bit_width: u8

Quantization bit width (2 or 4).

model_id: Option<String>

Model identifier (e.g. “intfloat/multilingual-e5-small”). None on indices written before this field existed — consumers treat that as “unknown, rebuild” so a prefix/policy change forces a rebuild even when dim is unchanged.

prefix_policy: Option<String>

Embedding policy tag (e.g. “e5-query-doc-v1”). Lets callers detect that the index was built with a different prefix scheme without bumping dim.

schema_version: Option<u32>

Caller-defined schema version for the vector store layout (chunking etc.).

Trait Implementations

impl Clone for IndexMeta

fn clone(&self) -> IndexMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IndexMeta

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for IndexMeta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for IndexMeta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.