EvalQuery problem

[ifq]

according to example.go,

    // Execute query
    result := make(map[uint64]struct{})
    var query interface{}
    json.Unmarshal([]byte(`["all"]`), &query)
    if err := db.EvalQuery(query, F, &result); err != nil {
        panic(err)
    }

EvalQuery returns result, which has key and value. but I printed value, it always be nil.

[HouzuoGuo]

Correct.
Query uses a Map to emulate a Set, therefore key set is the "set", values are not meaningful.

[ifq]

Http query ["all"] return all the document's content. How does that implemented? Get All id and read each one?

[HouzuoGuo]

"all" in query processor is optimized so that documents need not to be serialized, therefore it is a very fast operation, but still the entire collection file needs to be scanned.

HTTP query has three endpoints, "count" and "queryID" do not require document serialization, however "query" does.