Trait Row 

pub trait Row {
    // Required method
    fn get(&self, field: &FieldRef) -> Option<Value>;
}

Pluggable row-binding lookup. The evaluator stays agnostic of whether the caller has a slot vector indexed by planner-assigned position, a flat HashMap<String, Value>, or a graph binding — every consumer just provides a Row impl that resolves a FieldRef to a Value.

Required Methods

fn get(&self, field: &FieldRef) -> Option<Value>

Resolve a column / property reference. Returns None when the reference is unknown (the evaluator surfaces this as EvalError::UnknownColumn) or Some(Value::Null) when the column exists but the row’s value is null.

Implementors

impl<F> Row for F

where F: Fn(&FieldRef) -> Option<Value>,

Trivial Row impl over a flat (table, column) -> Value closure — useful for tests and for callers that only have a column-name map.