Struct TranslationContext 

pub struct TranslationContext {
    pub parameters: HashMap<String, Value>,
    pub outer_values: HashMap<String, Value>,
    pub variable_labels: HashMap<String, String>,
    pub variable_kinds: HashMap<String, VariableKind>,
    pub node_variable_hints: Vec<String>,
    pub mutation_edge_hints: Vec<String>,
    pub statement_time: DateTime<Utc>,
}

Context for expression translation.

Provides parameter values and schema information for resolving expressions.

Fields

parameters: HashMap<String, Value>

Parameter values for query parameterization.

outer_values: HashMap<String, Value>

Correlated outer values from Apply input rows (for subquery correlation). These take precedence over parameters during variable resolution to prevent YIELD columns from shadowing user query parameters.

variable_labels: HashMap<String, String>

Known variable to label mapping (for type inference).

variable_kinds: HashMap<String, VariableKind>

Variable kinds (node, edge, path) for identity column resolution.

node_variable_hints: Vec<String>

Node variable names from CREATE/MERGE patterns (separate from variable_kinds to avoid affecting property access translation). Used by startNode/endNode UDFs.

mutation_edge_hints: Vec<String>

Edge variable names from CREATE/MERGE patterns. Used by id() to resolve edge identity as _eid instead of the default _vid.

statement_time: DateTime<Utc>

Frozen statement clock for consistent temporal function evaluation. All bare temporal constructors (time(), datetime(), etc.) and their .statement()/.transaction() variants use this frozen instant so that duration.inSeconds(time(), time()) returns zero.

Implementations

impl TranslationContext

pub fn new() -> Self

Create a new empty translation context.

pub fn with_parameter(self, name: impl Into<String>, value: Value) -> Self

Add a parameter value.

pub fn with_variable_label( self, var: impl Into<String>, label: impl Into<String>, ) -> Self

Add a variable to label mapping.

Trait Implementations

impl Clone for TranslationContext

fn clone(&self) -> TranslationContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TranslationContext

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

Formats the value using the given formatter.

impl Default for TranslationContext

fn default() -> Self

Returns the “default value” for a type.