@Override
                public <R, C> R accept(Visitor<R, C> v, C context) {
                    return this.mixin.accept(v, context);
                }
Create a new ComparableExpression

@param expr Expression of type Comparable
@return new ComparableExpression
querydsl-core/src/main/java/com/querydsl/core/types/dsl/Expressions.java