presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorMetadata.java/RaptorMetadata/getSystemTable
class RaptorMetadata:    @Override
    public Optional<SystemTable> getSystemTable(ConnectorSession session, SchemaTableName tableName)
    {
        return getSourceTable(tableName)
                .map(this::getTableHandle)
                .map(handle -> new ColumnRangesSystemTable(handle, dbi));
    }