Currently we support only a few types in  the general path for decompressing interleaved data, for example:

https://github.com/10gen/mongo/blob/24bd7f6a18587606c8b62d2a26c35e94f1512c8b/src/mongo/bson/util/bsoncolumn_helpers.h#L696

We only support the 64-bit types that do not use delta-of-delta encoding at the moment.

We can group the remaining types into a few categories:

• doubles (they need the scaling from the control byte applied to the deltas)
• delta-of-delta types (e.g., timestamps, OIDs)
• 128-bit types

The general case for decompressing interleaved is quite similar to the iterator interface for decompression. The code _incrementInterleaved() and the different methods it calls can serve as a good example of how to get this functionality in the block-based version:

https://github.com/10gen/mongo/blob/24bd7f6a18587606c8b62d2a26c35e94f1512c8b/src/mongo/bson/util/bsoncolumn.cpp#L268