Struct QueryHints 

pub struct QueryHints {
    pub preferred_index: Option<IndexType>,
    pub limit: Option<usize>,
    pub offset: Option<usize>,
    pub use_bloom_filter: Option<bool>,
    pub enable_caching: Option<bool>,
    pub estimated_result_size: Option<usize>,
    pub timeout_ms: Option<u64>,
    pub collect_stats: bool,
}

Query hints for optimization

Fields

preferred_index: Option<IndexType>

Suggested index to use (SPO, POS, or OSP)

limit: Option<usize>

Maximum number of results to return

offset: Option<usize>

Number of results to skip (for pagination)

use_bloom_filter: Option<bool>

Whether to use bloom filter for existence checks

enable_caching: Option<bool>

Whether to enable result caching

estimated_result_size: Option<usize>

Estimated result size (helps with memory allocation)

timeout_ms: Option<u64>

Query timeout in milliseconds

collect_stats: bool

Whether to collect detailed execution statistics

Implementations

impl QueryHints

pub fn new() -> Self

Create new query hints with defaults

pub fn with_index(self, index: IndexType) -> Self

Set preferred index

pub fn with_limit(self, limit: usize) -> Self

Set result limit

pub fn with_offset(self, offset: usize) -> Self

Set result offset

pub fn with_bloom_filter(self, enable: bool) -> Self

Enable/disable bloom filter

pub fn with_caching(self, enable: bool) -> Self

Enable/disable caching

pub fn with_estimated_size(self, size: usize) -> Self

Set estimated result size

pub fn with_timeout(self, timeout_ms: u64) -> Self

Set query timeout

pub fn with_stats(self, collect: bool) -> Self

Enable statistics collection

pub fn auto_select_index( s_bound: bool, p_bound: bool, o_bound: bool, ) -> IndexType

Automatically select the best index based on query pattern

Returns the optimal index type based on which components are bound:

• If S is bound: use SPO
• If P is bound but S is not: use POS
• If O is bound but S and P are not: use OSP

pub fn merge(&self, other: &QueryHints) -> QueryHints

Merge with another set of hints (other takes precedence)

pub fn apply_pagination<T>(&self, results: Vec<T>) -> Vec<T>

Apply pagination to results

Trait Implementations

impl Clone for QueryHints

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryHints

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

Formats the value using the given formatter.

impl Default for QueryHints

fn default() -> Self

Returns the “default value” for a type.