pub const DEFAULT_DRIVER_NAME: &str = "default";Expand description
Pick a driver for adapter (user-supplied selector or
default ranking) and instantiate it.
selector_param is the workload param a user sets to override
the default — e.g. "cqldriver" for the cql adapter.
Single-name semantics by convention; comma-separated lists
are accepted (the runner walks them in order and takes the
first that’s compiled in).
Sentinel driver name for adapters that don’t have
multiple DriverImpl registrations (HTTP, stdout,
testkit, openapi — anything that registers only via
AdapterRegistration with a direct create
factory). The shared-pool path keys
SharedDriverRegistration by (adapter, driver);
single-engine adapters submit theirs with this sentinel
so the executor’s lookup finds them after
resolve_driver_name returns the same sentinel.