What is Parsing Engine?

PE is type of Vproc it takes SQL request and delivers SQL response.
It has software components to break SQL into steps, and send the steps to the AMPs.

Session Control
A session is nothing but logical connection between User and Application.Here it controls Authorization if its a Valid it does log on otherwise log off.
Parser
checks syntactical errors
checks semantical errors
checks existence of objects.
Dispatcher
It takes set of request and keep in a queue ,delivers set of responses by keeping the same queue that means it does request response flow control.