presto-main/src/main/java/io/prestosql/operator/TableScanWorkProcessorOperator.java/SplitToPages/getReadTime
class SplitToPages:        Duration getReadTime()
        {
            if (source == null) {
                return new Duration(0, NANOSECONDS);
            }

            return new Duration(source.getReadTimeNanos(), NANOSECONDS);
        }