What kind of queries? There's LMDB, but it's mostly k/v: https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Database https://en.wikipedia.org/wiki/Lightning_

What kind of queries? There's LMDB, but it's mostly k/v: https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Database https://en.wikipedia.org/wiki/Lightning_Memory-Mapped_Databa...