code: func (t QueryStreamType) queryValue() logpb.StreamType {
  	switch t {
  	case Text:
  		return logpb.StreamType_TEXT
  	case Binary:
  		return logpb.StreamType_BINARY
  	case Datagram:
  		return logpb.StreamType_DATAGRAM
  	default:
  		return -1
  	}
  }
docs: // queryValue returns the StreamType for a specified QueryStreamType parameter.
  // If no StreamType is specified (Any), it will return -1 to indicate this.