mysql profiler “Sending data”

Question

Is there an explanation of these statuses anywhere?

http://dev.mysql.com/tech-resources/articles/using-new-query-profiler.html

my specific question is in reg

Answer 1

before sending data to client, mysql need to read data, the phase of read data may take the majrity time of "sending data"

Answer 2

http://dev.mysql.com/doc/refman/5.0/en/general-thread-states.html

Executing means the thread has started execution, Sending data apparently covers both the processing of the rows and sending the count back to the client.