可以使用loadTable根据表名获取BasicTable对象

List<Entity> arguments1 = new ArrayList<Entity>(1);
BasicTable table1 = (BasicTable) conn.run("loadTable('dfs://testDatabase','pt')");
arguments1.add(table1);
BasicStringVector o1 = (BasicStringVector)conn.run("columnNames",arguments1);
System.out.println(o1.getString());