Method compatible

src/sql/src/func.rs:1366–1373

(&self, ecx: &ExprContext, from: &SqlScalarType, to: &SqlScalarType)

impl PolymorphicCompatClass {
    fn compatible(&self, ecx: &ExprContext, from: &SqlScalarType, to: &SqlScalarType) -> bool {
        use PolymorphicCompatClass::*;
        match self {
            StructuralEq => from.structural_eq(to),
            Any => from.base_eq(to),
            _ => typeconv::can_cast(ecx, CastContext::Implicit, from, to),
        }
    }
}

/// Represents a solution to a set of polymorphic constraints, expressed as the