@Override
    public BooleanExpression as(Path<Boolean> alias) {
        return Expressions.booleanOperation(Ops.ALIAS, mixin, alias);
    }
{@code BooleanExpression} represents {@link java.lang.Boolean} expressions

@author tiwe
@see java.lang.Boolean
querydsl-core/src/main/java/com/querydsl/core/types/dsl/BooleanExpression.java