Can't decode nested array in JSON about xephon-k HOT 1 CLOSED

type readRequest struct {
	StartTime  int64           `json:"start_time,omitempty"`
	EndTime    int64           `json:"end_time,omitempty"`
	QueriesRaw json.RawMessage `json:"queries,omitempty"`
	Queries    []common.Query  `json:"queries_that_cant_be_directly_unmsharl_to"`
}

// for avoid recursion in UnmarshalJSON
type readRequestAlias readRequest

// UnmarshalJSON implements Unmarshaler interface
func (req *readRequest) UnmarshalJSON(data []byte) error {
	// NOTE: need to use Alias to avoid recursion
	// http://choly.ca/post/go-json-marshalling/
	// http://stackoverflow.com/questions/29667379/json-unmarshal-fails-when-embedded-type-has-
	a := (*readRequestAlias)(req)
	err := json.Unmarshal(data, a)
	if err != nil {
		return err
	}
	err = json.Unmarshal(req.QueriesRaw, &req.Queries)
	if err != nil {
		return errors.Wrap(err, "queries field is not provided")
	}
	return nil
}