Metadata for use in BigQueryIO, i.e. a job_id to use in BQ job labels.
Creates a BigQueryIOMetadata.
This will request metadata properly based on which runner is being used.
Metadata class for BigQueryIO. i.e. to use as BQ job labels.
Do not construct directly, use the create_bigquery_io_metadata factory. Which will request metadata properly based on which runner is being used.