Is your feature request related to a problem? Please describe.
Data too big for dataframes.

Describe the solution you'd like
A clear and concise description of what you want to happen.

Have feature data joining directly put the training dataset in a BQ table. User may be able to choose table name, whether to replace, expiration, etc.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

N/A

Additional context
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