What SQL statement is sent to Sqlalchemy when pool_pre_ping=True

[sollymay]

I've been trying to read through the documentation to understand if psycopg2 sends anything other than a SELECT 1 when the pool_pre_ping value is set to True on sqlalchemy or if this is the default?

[dvarrazzo]

You should ask the SQLAlchemy project not us...

Paycopg2 doesn't support sending an empty query, so likely they send a SELECT 1, but you should ask them.