This changes how collections behave conceptually in the Gen3 butler:
- a “run” is now a special type of collection, rather than an entity that is associated with a collection;
- the only kind of collection we had before is now called a “tagged” collection;
- we now also have “chained” collections, which are simply an ordered list of other collections to be searched.
It changes some particularly prominent interfaces, including:
- the arguments used to construct a
Butlercan now search an ordered list of collections, not just a single one);
- the command-line arguments used to pass output collections to the
Many lower-level interfaces (including
Registry query methods) have had minor changes as well.
The RFC itself is still a good overview and description of intent and motivation, but new package docs in daf_butler:
and command-line help for
pipetask should be consulted for the details.