The function parses Apache log files with the following constraints:
- Log files are loaded into a table
- One line of the Apache log file is loaded to one row in the table
- If you specify a custom log format, the input must conform to that format.
- If you do not specify a custom format string with the Log_Format argument, the function parses the logs with the NCSA extended/combined format, which is defined as:
"%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\""