count may not yield before paging in initial candidate documents

                if ( !ccPointer ) {

                    if ( timeToStartYielding.intervalHasElapsed() ) {

                        // Lazily construct a ClientCursor, avoiding a performance regression when scanning a very

                        // small number of documents.

                        ccPointer.reset( new ClientCursor( QueryOption_NoCursorTimeout, cursor, ns ) );

                    }

                }

                else if ( !ccPointer->yieldSometimes( simpleEqualityMatch ? ClientCursor::DontNeed : ClientCursor::MaybeCovered ) ||

                         !cursor->ok() ) {

                    break;

                }