N1QL without primary index

SQL++
1

Can I do N1QL query with only view index ?

This post said "It is the basic requirement to be able to use the query language on your data".

This post said it’s not.

Here’re my sql list:

//create view index
CREATE INDEX idx_tp_app_mt ON default(tp,app,mt) WHERE tbl == 'dv';

//query on view index
EXPLAIN SELECT * FROM default USE INDEX(idx_tp_app_mt USING VIEW)WHERE tp = 'i'

When I try query with only one view index. the server returns

[
  {
     "code": 4000,
     "msg": "No primary index on keyspace default. Use CREATE PRIMARY INDEX to create one."
   }
]

What I need is doing N1QL query without primary index (it use too much resource).

Thanks