Function get_cast

fn get_cast(
    ecx: &ExprContext<'_>,
    ccx: CastContext,
    from: &SqlScalarType,
    to: &SqlScalarType,
) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>>

Get casts directly between two SqlScalarTypes, with control over the allowed CastContext.