func Build(stmt algebra.Statement, datastore, systemstore datastore.Datastore,
namespace string, subquery bool) (plan.Operator, error) {
builder := newBuilder(datastore, systemstore, namespace, subquery)
o, err := stmt.Accept(builder)
if err != nil {
return nil, err
}
op := o.(plan.Operator)
_, is_prepared := o.(*plan.Prepared)
if !subquery && !is_prepared {
privs, er := stmt.Privileges()
if er != nil {
return nil, er
}
if len(privs) > 0 {
op = plan.NewAuthorize(privs, op)
}
return plan.NewSequence(op, plan.NewStream()), nil
} else {
return op, nil
}
}
func BuildPrepared(stmt algebra.Statement, datastore, systemstore datastore.Datastore,
namespace string, subquery bool) (*plan.Prepared, error) {
operator, err := Build(stmt, datastore, systemstore, namespace, subquery)
if err != nil {
return nil, err
}
signature := stmt.Signature()
return plan.NewPrepared(operator, signature), nil
}