Type Alias BoxedCondition 

pub type BoxedCondition<'a, QS, DB> = Box<dyn BoxableExpression<QS, DB, SqlType = Nullable<Bool>> + 'a>;

A filter condition on the table QS, boxed for a boxed query’s filter.

Nullable: a comparison with a nullable column, or with a NULL value, may be NULL.

Aliased Type

pub struct BoxedCondition<'a, QS, DB>(/* private fields */);