Enum Predicate 

pub enum Predicate {
    Comparison(Comparison),
    And(Vec<Predicate>),
    Or(Vec<Predicate>),
}

Abstract Syntax Tree (AST) node for condition evaluation.

Predicates can be nested to form complex logical expressions.

Variants

• Comparison: Leaf node (single field comparison)
• And: All child predicates must be true
• Or: At least one child predicate must be true

Examples

Simple comparison:

{"user.tier": {"$eq": "Gold"}}

Complex AND:

{"user.tier": {"$eq": "Gold"}, "amount": {"$gt": 100}}

Explicit OR:

{"$or": [{"tier": {"$eq": "Gold"}}, {"tier": {"$eq": "Platinum"}}]}

Variants

Comparison(Comparison)

And(Vec<Predicate>)

Or(Vec<Predicate>)

Trait Implementations

impl Clone for Predicate

fn clone(&self) -> Predicate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predicate

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

Formats the value using the given formatter.

impl Serialize for Predicate

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.