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