public static function copyFrom(ExpressionBuilder $otherInstance)
    {
        $copyingInstance = new self($otherInstance->fieldName);
        $copyingInstance->simpleOperator = $otherInstance->simpleOperator;
        $copyingInstance->simpleValue = $otherInstance->simpleValue;
        $copyingInstance->listOperator = $otherInstance->listOperator;
        $copyingInstance->listValues = $otherInstance->listValues;
        return $copyingInstance;
    }