[jefb]

> Because this storage system’s query language is more powerful than the underlying one’s, its read operations in general may overfetch and then filter results.

Seems like this is the crux of the problem. Migrating and/or replicating data to an underlying data layer that supports the required query logic probably makes more sense?

[dmurray]

Compared to maintaining 200 lines of code?

I'd at least be waiting for the next feature request of "can we just add one more operation to match()" before saying we needed to move our whole storage layer to something else.