presto-jmx/src/main/java/io/prestosql/plugin/jmx/JmxRecordSetProvider.java/JmxRecordSetProvider/getColumnNames
class JmxRecordSetProvider:    private static Set<String> getColumnNames(List<? extends ColumnHandle> columnHandles)
    {
        return columnHandles.stream()
                .map(column -> (JmxColumnHandle) column)
                .map(JmxColumnHandle::getColumnName)
                .collect(Collectors.toSet());
    }