Extensions
Features
While the `delta` extension is still experimental, many (scanning) features and optimizations are already supported:  
* multithreaded scans and Parquet metadata reading
* data skipping/filter pushdown
* skipping row-groups in file (based on Parquet metadata)
* skipping complete files (based on Delta partition information)
* projection pushdown
* scanning tables with deletion vectors
* all primitive types
* structs
* S3 support with secrets  
More optimizations are going to be released in the future.