NewSpanReader returns a new SpanReader.

ErrDurationAndTagQueryNotSupported occurs when duration and tags are both set.

ErrDurationMinGreaterThanMax occurs when duration min is above duration max.

ErrMalformedRequestObject occurs when a request object is nil.

ErrServiceNameNotSet occurs when attempting to query with an empty service name.

ErrStartAndEndTimeNotSet occurs when start time and end time are not set.

ErrStartTimeMinGreaterThanMax occurs when start time min is above start time max.