[Bug]: desc table is broken

[fengttt]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Environment

- Version or commit-id (e.g. v0.1.0 or 8b23a93):
- Hardware parameters:
- OS type:
- Others:

Actual Behavior

mysql> desc t; +------------------------------------------------------------------------------------------+ | QUERY PLAN | +------------------------------------------------------------------------------------------+ | Project(cost=0.00..0.00 card=88.00 ndv=0.00 rowsize=0) | | -> Table Scan on mo_catalog.mo_columns(cost=0.00..0.00 card=88.00 ndv=0.00 rowsize=0) | | Filter Cond: (mo_columns.att_database = 'foo'), (mo_columns.att_relname = 't') | +------------------------------------------------------------------------------------------+ 3 rows in set (0.00 sec)

mysql>

Expected Behavior

Describe the table, instead of explaining some query.

Steps to Reproduce

No response

Additional information

No response