presto-jmx/src/main/java/io/prestosql/plugin/jmx/JmxHistoricalData.java/JmxHistoricalData/getRows
class JmxHistoricalData:    public synchronized List<List<Object>> getRows(String objectName, List<Integer> selectedColumns)
    {
        String lowerCaseObjectName = objectName.toLowerCase(Locale.ENGLISH);
        if (!tableData.containsKey(lowerCaseObjectName)) {
            return ImmutableList.of();
        }
        return projectRows(tableData.get(lowerCaseObjectName), selectedColumns);
    }