Backend constructor/connect method that supports already-constructed google.cloud.bigquery.Client

[toryhaavik]

In some cases, it's easier to construct your own bq.Client than delegate to the Backend.connect method. Couldn't there be a factory function and/or Backend constructor that takes an already-created Client?

[tswast]

Thanks for the request! This sounds reasonable to me. I believe the connect method is pretty flexible with regards to the arguments it accepts. I'd be open to a PR that added a bqclient (or similar) keyword argument and bypasses the current client authentication and construction logic.

[goodwanghan]

I am also looking for this feature