Behind Delta tables is the data stored in Parquet file formats?
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
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Behind Delta tables is the data stored in Parquet file formats?
### Input: 
### Response: 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