Consider the below SQL generate by Hibernate for reading an object by primary key.

select
person0_.ID as ID1_0_0_,
person0_.firstName as firstNam3_0_0_,
person0_.lastName as lastName4_0_0_,
person0_.salary as salary5_0_0_,
from
Person person0_
where
person0_.ID=?

I do not understand the reason for naming person0_ with a zero and an underscore.
This naming strategy makes the query unreadable and probably un-cacheable by the database such that the DB has to generate a new plan every time for this query (Not too sure about this one though, but answers on StackOverflow seem to indicate this).

I looked at http://docs.jboss.org/hibernate/orm/4.2/devguide/en-US/html/ but could not find any good reason for this naming strategy.
Please note this in documentation if this is a feature, else it should be removed.