initializes the appropriate driver from the driver string given.
should be the character name of the driver to initiate. in this package, "BigQuery"
a DBIDriver object for the specified database. In BigQuery's case, a BQDriver. Note that BQDriver is a singleton; only one object of its class should be instantiated at a time.
signature(drvName = "character"), ...
calls the initialization function appropriate to driver name specified.
Syntactically equal to
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