potiuk edited a comment on issue #20308:
URL: https://github.com/apache/airflow/issues/20308#issuecomment-1057869795


   Actually It might, in case Lock is kept as an object in the session. I am 
not sure what kind of "objects" are kept in the session. Funny thing that 
statement about in the documentation of SQLAlchemy is a bit ambiguous. I am not 
a native speaker but IMHO it's not  obvious at all oif "and releases any 
transactional/connection resources" refers to "close()" or "expunge_all()" 
method. 
   
   At a first glance, it should be about "close()", but if Locks are 
represented as objects in the session, expunge_all() might also release locks. 
WDYT @andrewgodwin @ashb ?
   
   https://docs.sqlalchemy.org/en/14/orm/session_basics.html#closing
   
   > The Session.close() method issues a Session.expunge_all() which removes 
all ORM-mapped objects from the session, and releases any 
transactional/connection resources from the Engine object(s) to which it is 
bound. When connections are returned to the connection pool, transactional 
state is rolled back as well.


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