<|im_start|>user
Behind Delta tables is the data stored in Parquet file formats?<|im_end|>
<|im_start|>assistant
Yes, they are parquet.  Delta API is a protocol and the layer manages the individual parquet files as if they were a larger table.  If BQ can consume from the Delta protocol it could work but I would not suggest reading the files inside of a Delta table as just a parquet table - there would likely be too many stale files<|im_end|>
