Struct QueryEngine 

pub struct QueryEngine { /* private fields */ }

Query engine - high-level interface for executing queries

Includes an LRU AST cache that eliminates repeated parsing overhead for identical queries. The cache is keyed by whitespace-normalized query strings and evicts least-recently-used entries when full.

Implementations

impl QueryEngine

pub fn new() -> Self

Create a new query engine with the default cache capacity (1024 entries)

pub fn with_capacity(capacity: usize) -> Self

Create a new query engine with a specific cache capacity

pub fn cache_stats(&self) -> &CacheStats

Return a reference to the cache statistics (hits/misses).

pub fn cache_len(&self) -> usize

Return the current number of entries in the cache.

pub fn execute( &self, query_str: &str, store: &GraphStore, ) -> Result<RecordBatch, Box<dyn Error>>

Parse and execute a read-only Cypher query (MATCH, RETURN, etc.) Supports multiple semicolon-separated statements.

pub fn execute_mut( &self, query_str: &str, store: &mut GraphStore, tenant_id: &str, ) -> Result<RecordBatch, Box<dyn Error>>

Parse and execute a write Cypher query (CREATE, DELETE, SET, etc.) Supports multiple semicolon-separated statements. Each statement sees the effects of previous statements (shared store). Also rewrites multi-CREATE queries to use WITH for variable sharing.

Trait Implementations

impl Default for QueryEngine

fn default() -> Self

Returns the “default value” for a type.