Cool feature: index a list of values

[o0101]

Accept indexing and querying over a list of values, with queries of any other list of values.

In other words if we request an indexed table with a field that is an array, we should be able to specify a "fuzzy" or "partial" match for that array based on overlap between the query list and the indexed list.

we should be able to specify (or implement default fast and useful) methods for calculating that overlap.
hello cosine similarity, et al.