Function mentat_query_projector::query_projection

pub fn query_projection(
    schema: &Schema, 
    query: &AlgebraicQuery
) -> Result<Either<ConstantProjector, CombinedProjection>>

Compute a suitable SQL projection for an algebrized query. This takes into account a number of things:

• The variable list in the find spec.
• The presence of any aggregate operations in the find spec. TODO: for now we only handle simple variables
• The bindings established by the topmost CC.
• The types known at algebrizing time.
• The types extracted from the store for unknown attributes.