Duplicated table name is not a bug from a raw query plan.
If the query which is executed by the user, has a table name with an alias, it will be displayed with a table name and an alias on there.
But, I understand your viewpoint, I'd like to fix this issue for users.
I will fix this bug.
For reference, before cubrid 9.0, it was shown as "fixed cpu, variable cpu, fixed io, variable io".
It will be shown only total cost for easy to read after this release.