bigquery: Use streaming API #328
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Removes the need of BigQuery records buffering in a local file for 5 minutes.
The bigquery.load() API has a rate limit of "Load jobs per table per day — 1,500 (including failures)"
The bigquery.insert() (streaming) API does not have such rate limit but it costs: "$0.010 per 200 MB"
See:
https://cloud.google.com/bigquery/streaming-data-into-bigquery
https://cloud.google.com/bigquery/quotas#streaming_inserts
https://cloud.google.com/bigquery/pricing#streaming_pricing