Some Google products export data directly into BigQuery tables. When you add a BigQuery connection to Data Studio, Data Studio will automatically enrich the fields to include common aggregations, calculations, and field names.
Explore BigQuery data in Data Studio
Data analysts can explore BigQuery data using Data Studio from within the BigQuery console. Simply run your query or select a table, and then use the Explore in Data Studio option to visualize the data in a Data Studio report.
BigQuery BI Engine
BigQuery BI Engine is a fast, in-memory analysis service. By using BigQuery BI Engine with Data Studio, you can significantly improve your report performance while reducing compute costs.
Introduction to BigQuery BI Engine.
Google Analytics BigQuery export
When Data Studio encounters a table that was generated by Google Analytics BigQuery Export, the table will have a Google Analytics icon next to it. When you connect a Google Analytics table into Data Studio, many of the common metrics found in Google Analytics will automatically be created as Data Studio fields.