GoCB appears to be ignoring partial view query errors

In certain cases, couchbase server views can return a 200 response code with partial errors embedded.  See this ngrep capture for example HTTP traffic.

Based on looking at the GoCB code, I'm seeing a mismatch in field names related to partial errors:

• In this ngrep capture, the field name is "errors"
• The gocb code in bucket_viewquery.go is looking for a field called "error" (singular vs plural)

Depending on the outcome of the discussion in MB-25068 (see comment about handling failure cases), it might also be useful to add the ability of the caller to get at these partial errors.

In the Sync Gateway case, since we are essentially proxying view query results back to a client that is calling the SG Views API, we just need a way to propagate these errors back.  At the moment, it doesn't look like GoCB is exposing the errors that can come back from Couchbase Server in the "errors" field of the view query response.

Versions

Gocb commit: 0cd63ba8b594091ea0005ec50ee21299e0b22d97

Gocb core commit: 

6b3fcad8ac5e2212fad55e57d481cb056b99f3c0

Related tickets

https://issues.couchbase.com/browse/MB-25068

https://github.com/couchbase/sync_gateway/issues/2682