Trait mz_sql::query_model::attribute::core::Attribute

pub(crate) trait Attribute: Debug + 'static {
    fn attr_id(&self) -> &'static str;
    fn requires(&self) -> Vec<Box<dyn Attribute>> ;
    fn derive(&self, model: &mut Model, box_id: BoxId);
}

A trait that defines the logic for deriving an attribute.

Required Methods

fn attr_id(&self) -> &'static str

A globally unique identifier for this attribute type.

fn requires(&self) -> Vec<Box<dyn Attribute>>

A vector of attributes that need to be derived before this attribute.

fn derive(&self, model: &mut Model, box_id: BoxId)

A function that derives at a specific BoxId.

Trait Implementations

impl Hash for dyn Attribute

A naive Hash for attributes that delegates to the associated std::any::TypeId.

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

impl PartialEq<dyn Attribute + 'static> for dyn Attribute

A naive PartialEq implementation for Attribute trait objects that differentiates two attributes based on their std::any::TypeId.

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for dyn Attribute

An evidence that the PartialEq implementation for Attribute is an equivalence relation.

Implementors

impl Attribute for PropagatedNulls

impl Attribute for RejectedNulls

impl Attribute for RelationType