Query

lance_index::vector

Struct Query 

Source 
pub struct Query {
    pub column: String,
    pub key: ArrayRef,
    pub k: usize,
    pub lower_bound: Option<f32>,
    pub upper_bound: Option<f32>,
    pub minimum_nprobes: usize,
    pub maximum_nprobes: Option<usize>,
    pub ef: Option<usize>,
    pub refine_factor: Option<u32>,
    pub metric_type: DistanceType,
    pub use_index: bool,
    pub dist_q_c: f32,
}
Expand description

Query parameters for the vector indices

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§column: String

The column to be searched.

§key: ArrayRef

The vector to be searched.

§k: usize

Top k results to return.

§lower_bound: Option<f32>

The lower bound (inclusive) of the distance to be searched.

§upper_bound: Option<f32>

The upper bound (exclusive) of the distance to be searched.

§minimum_nprobes: usize

The minimum number of probes to load and search. More partitions will only be loaded if we have not found k results, or the the algorithm determines more partitions are needed to satisfy recall requirements.

The planner will always search at least this many partitions. Defaults to 1.

§maximum_nprobes: Option<usize>

The maximum number of probes to load and search. If not set then ALL partitions will be searched, if needed, to satisfy k results.

§ef: Option<usize>

The number of candidates to reserve while searching. this is an optional parameter for HNSW related index types.

§refine_factor: Option<u32>

If presented, apply a refine step. TODO: should we support fraction / float number here?

§metric_type: DistanceType

Distance metric type

§use_index: bool

Whether to use an ANN index if available

§dist_q_c: f32

the distance between the query and the centroid this is only used for IVF index with Rabit quantization

Trait Implementations§

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impl Clone for Query

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fn clone(&self) -> Query

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Query

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

Formats the value using the given formatter. Read more
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impl From<&Query> for FlatQueryParams

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fn from(q: &Query) -> Self

Converts to this type from the input type.
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impl From<&Query> for HnswQueryParams

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fn from(query: &Query) -> Self

Converts to this type from the input type.

Auto Trait Implementations§

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impl Freeze for Query

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impl !RefUnwindSafe for Query

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impl Send for Query

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impl Sync for Query

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impl Unpin for Query

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impl !UnwindSafe for Query

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