Problem/Motivation
For database drivers that override an other database driver, such as https://www.drupal.org/project/pgsql_fallback, have to create their own implementation for backend overridden services. The PostgreSQL fallback driver has to create its own service for the pgsql.views.date_sql service. This is problematic because the PostgreSQL fallback driver lives in a module and it is not enabled by default and therefor the backend overridden service does not exist until it is enabled.
Core now only uses the driver name to check for a backend overridden service. The PostgreSQL fallback driver has the driver name "PgsqlFallback", not "pgsql".
Proposed resolution
Make the backend overridable discovery also check with for the Connection->databaseType() service override when there is no override for Connection->driver() service.
Remaining tasks
TBD
User interface changes
None
API changes
None
Data model changes
None
Release notes snippet
TBD