fix(tdengine): show database objects without schema layer

agents/drivers/tdengine/src/main/java/com/dbx/agent/tdengine/TDengineAgent.java

@@ -90,11 +90,7 @@ public final class TDengineAgent extends BaseDatabaseAgent {
 
     @Override
     public List<String> listSchemas() {
-        List<String> result = new ArrayList<>();
-        for (DatabaseInfo database : listDatabases()) {
-            result.add(database.getName());
-        }
-        return result;
+        return Collections.emptyList();
     }
 
     @Override

agents/drivers/tdengine/src/test/java/com/dbx/agent/tdengine/TDengineAgentTest.java

@@ -82,6 +82,15 @@ class TDengineAgentMetadataTest {
         );
     }
 
+    @Test
+    void doesNotExposeDatabasesAsSchemas() {
+        TDengineAgent agent = new TDengineAgent();
+        TestSupport.setPrivateConnection(agent, JdbcMetadataSqlFake.connection());
+
+        Assertions.assertTrue(agent.listSchemas().isEmpty());
+        Assertions.assertTrue(JdbcMetadataSqlFake.statements.isEmpty());
+    }
+
     @Test
     void setsDatabaseBeforeExecutionWhenSchemaIsProvided() {
         TDengineAgent agent = new TDengineAgent();