Method eval

nodedb-query/src/expr/eval.rs:59–65

Evaluate this expression against a document. Column references look up fields in the document. Missing fields return `Null`. Arithmetic on non-numeric values returns `Null`. `OldColumn(..)` resolves to `Null` (use `eval_with_old` for the TRANSITION CHECK path).

(&self, doc: &Value)

    /// `OldColumn(..)` resolves to `Null` (use `eval_with_old` for the
    /// TRANSITION CHECK path).
    pub fn eval(&self, doc: &Value) -> Value {
        self.eval_scope(&RowScope {
            new_doc: doc,
            old_doc: None,
            excluded_doc: None,
        })
    }

    /// Evaluate with access to both NEW and OLD documents, used by
    /// TRANSITION CHECK predicates. `Column(name)` resolves against