Columnar data representation can be optimized and designed for a wild range of query and data types that have non-aligned constraints. So yes, you can have 3,

Columnar data representation can be optimized and designed for a wild range of query and data types that have non-aligned constraints. So yes, you can have 3, or 12 for that matter. I think we'll see more & more purpose-specific database technologies as gains from Moore's laws and its analogues start slowing down, and some previously niche application areas become high-$ areas with larger user bases.