Some changes when using the "count" feature with a DBAL query builder :

• The default behavior is no longer count_by_sub_request but is now count_by_select_all (new behavior that performs a SELECT count(*) FROM ...).
• When the count_by_sub_request behavior is used, the connection option (an instance of Doctrine\DBAL\Connection) is now required.

Refer to the full documentation for available options.