SSHandler is used to explain alias.** to real columns in SQL, transient
columns not included, the example:
select u.** from users u ==> select u.name as u_name, u.address as u_address
from users u
SS means star-star
SSMapListHandler is a SqlHandler used to explain alias.** to real columns in
SQL and return a Map List, SS means star-star, example:
select u.** from users u ==> select u.name as u_name, u.address as u_address
from users u