We are using PolarDB 8.0.1, we want to archive the old data partition to csv/orc format to save storage space (only store current data in the ibd file). We tried it at table level, and it seems work fine:

Alter table table_name storage_type oss

But the following command does not work, any idea?

Alter table table_name change partition part_name engine = csv

We tried it at table level, and it seems work fine:

Alter table table_name storage_type oss