Stefan Manegold wrote:

when BATpreloading the sequentially accessed outer BAT, make sure we also BATpreload the (often) randomly accessed "inner" BAT

We probably also have to inject advice for the target variable(s), because it is likely to be used in the future a BUF_WILLNEED might be appropriate to avoid early eviction. This advice should be given when we create them, e.g. in BATnew?