public Object get(Type type) {
        Object result = entries.get(type);
        if (result == null && !entries.containsKey(type)) {
            throw new IllegalArgumentException("no result stored for " + type);
        }
        return result;
    }
Return the value mapped for a given type.
@param type the type that was mapped
@return the value for that type
core/src/main/java/org/jdbi/v3/core/mapper/JoinRow.java