myself shyam ;
i want to understand the code of the mysql which is related to the sum
operation means what is the actual flow at the code level for a particular
query like suppose
we fire a query like select sum(salary) from employee where salary < 10000;
so guide me to understand the actual flow of mysqlcode for sum operation .
means in which modules it start and where it parsed and all flows for this
means describe me for take a example of sum query what function is
called during parsing phases and optimization phases and how this
query called the sum operation .
a lot of thanks