How would one build a relational database on a key-value store, a-la Berkeley DB's SQL interface?

Posted by coleifer on Programmers See other posts from Programmers or by coleifer
Published on 2012-05-26T19:11:02Z Indexed on 2012/06/27 21:25 UTC
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sql

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nosql

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relational-database

I've been checking out Berkeley DB and was impressed to find that it supported a SQL interface that is "nearly identical" to SQLite.

http://docs.oracle.com/cd/E17076_02/html/bdb-sql/dbsqlbasics.html#identicalusage

I'm very curious, at a high-level, how this kind of interface might have been architected. For instance:

since values are "transparent", how do you efficiently query and sort by value
how are limits and offsets performed efficiently on large result sets
how would the keys be structured and serialized for good average-case performance

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