Support aggregation pseudo-collections

Brilliant lib.

Does it or are there plans to support more complex queries of collections such as aggregations? Or is there a way to source the table data from a function rather than a collection (so I can do the more complex queries in the function?).. or some other way of achieving the same

The issue does not name any files, tests, or entry points. Start by reviewing how table data is currently sourced and how collection queries are represented, then define the supported aggregation or function-based source behavior and its completion criteria.

Written by the indexing model from the issue text.