Describe the bug
When using Oracle as a data source, regardless of which schema name is selected, the system always returns tables from the SYSTEM schema.

To Reproduce
Steps to reproduce the behavior:

Configure Wren AI engine to connect to an Oracle database.
Attempt to select a specific schema other than SYSTEM (e.g., SCOTT or a custom schema).
Observe the list of tables returned by the Wren AI engine.
Expected behavior
When a specific Oracle schema is inputed , the Wren AI engine should display only the tables from the inputed schema, not the SYSTEM schema.

OS: Windows 10, Ubuntu 22.04 LTS
Wren Engine Version: 0.16.1
Oracle Database Version: Oracle 12c