presto-main/src/main/java/io/prestosql/connector/system/SystemColumnHandle.java/SystemColumnHandle/toSystemColumnHandles
class SystemColumnHandle:    public static Map<String, ColumnHandle> toSystemColumnHandles(ConnectorTableMetadata tableMetadata)
    {
        return tableMetadata.getColumns().stream().collect(toImmutableMap(
                ColumnMetadata::getName,
                column -> new SystemColumnHandle(column.getName())));
    }