Enum ScanMethod 

pub enum ScanMethod {
    FullScan {
        table: String,
    },
    PointQuery {
        table: String,
        column: String,
        value: Value,
    },
    RangeQuery {
        table: String,
        column: String,
        start: Value,
        start_inclusive: bool,
        end: Value,
        end_inclusive: bool,
    },
    TextSearch {
        table: String,
        column: String,
        query: String,
    },
    VectorSearch {
        table: String,
        column: String,
        query_vector: ArcVec,
        k: usize,
    },
    SpatialRange {
        table: String,
        column: String,
        min_x: f64,
        min_y: f64,
        max_x: f64,
        max_y: f64,
    },
    PrimaryKeyScan {
        table: String,
        ascending: bool,
        limit: Option<usize>,
    },
    IndexIntersection {
        table: String,
        column1: String,
        value1: Value,
        column2: String,
        value2: Value,
    },
}

Scan method for data access

Variants

FullScan

Full table scan

Fields

table: String

PointQuery

Point query using column index

Fields

table: String

column: String

value: Value

RangeQuery

Range query using column index

边界语义

• start_inclusive: 下界是否包含（>= vs >）
• end_inclusive: 上界是否包含（<= vs <）

Fields

table: String

column: String

start: Value

start_inclusive: bool

end: Value

end_inclusive: bool

TextSearch

Text search using full-text index

Fields

table: String

column: String

query: String

VectorSearch

Vector KNN search

Fields

table: String

column: String

query_vector: ArcVec

k: usize

SpatialRange

Spatial range query

Fields

table: String

column: String

min_x: f64

min_y: f64

max_x: f64

max_y: f64

PrimaryKeyScan

Primary key index scan (ordered by primary key)

Used when:

• ORDER BY primary_key [ASC/DESC]
• Optional: LIMIT n

Benefits:

• No in-memory sorting needed
• Can early terminate with LIMIT
• O(k) instead of O(n log n) for sorting

Fields

table: String

ascending: bool

limit: Option<usize>

IndexIntersection

Multi-index intersection: use two column indexes and intersect row IDs. For WHERE col1 = v1 AND col2 = v2, look up both indexes and take the intersection of matching row IDs, then batch-fetch only those rows.

Fields

table: String

column1: String

value1: Value

column2: String

value2: Value

Implementations

impl ScanMethod

pub fn table_name(&self) -> &str

Trait Implementations

impl Clone for ScanMethod

fn clone(&self) -> ScanMethod

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ScanMethod

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

Formats the value using the given formatter.