[](https://news.ycombinator.com/item?id=27248960) That thread could probably use some corrections to (probably incorrect?) statements made in that small thread about virtual tables and `xBestIndex`. Specifically how to implement *multi-column indexing* of vtables. For sure, a *manual* on various techniques around virtual tables and their indexing would be welcome. The current docs are accurate, and there are many examples, but perhaps a more newbie-friendly additional approach, based on commenting existing vtables examples, would be helpful to many.