public static <A> A alias(Class<A> cl, String var) {
        return aliasFactory.createAliasForVariable(cl, var);
    }
Create a new alias proxy of the given type for the given variable

@param cl type of the alias
@param var variable name for the underlying expression
@return alias instance
querydsl-core/src/main/java/com/querydsl/core/alias/Alias.java