ip_address, which consists in a unique string of characters that identifies each computer using the Internet Protocol to communicate over a network;
request, which is the parameter “REQUEST” from apache; 
user_agent, which consists in a user agent is a computer program representing a person;
trackingid, consists of a unique value that identifies the user, the search, and the session;
timestamp, the instant when the user submitted a request (i.e., query or click);
year, month, day, hour, minute, which consists of values generated through the timestamp column;
type_search, indicates the type of search;
query, the set of keywords submitted by the user;
page, is the page of the click;
maxitems, is the value of maximum items per SERP page;
page_search_response, the time to return a response from Page Search API; 
image_search_response, the time to return a response from Image Search API;
page_search_results, the list of results returned to the user for a given query on page search (only field when there is a click);
image_search_results, the list of results returned to the user for a given query on image search (only field when there is a click);
session_id, the session id from jsp;
position, which is the position clicked by user;
country, the country based on IP address (https://ipinfo.io/);
city, the city based on IP address (https://ipinfo.io/);
isp, the isp based on IP address (https://ipinfo.io/);
province, the province based on IP address (https://ipinfo.io/);
timezone, the timezone based on IP address (https://ipinfo.io/);
hostname, the hostname based on IP address (https://ipinfo.io/);
type_device, the type of device based on User Agent (https://pypi.org/project/user-agents/);
browser_family, the browser family based on User Agent (https://pypi.org/project/user-agents/);
browser_version, the browser version based on User Agent (https://pypi.org/project/user-agents/);
os_family, the operating system family based on User Agent (https://pypi.org/project/user-agents/);
os_version, the operating system version based on User Agent (https://pypi.org/project/user-agents/);
device_family, the device family based on User Agent (https://pypi.org/project/user-agents/);
device_brand, the device brand  based on User Agent (https://pypi.org/project/user-agents/); 
device_model, the device model based on User Agent (https://pypi.org/project/user-agents/); 
absolute position, the absolute position in the SERPs;