Get table name and alias from string with symbols

https://github.com/yiisoft/active-record/pull/545/changes/BASE..dc1ccc01420b562a7c675b133c4e8847baa40fd6#diff-9a722a8f10f10a61d4444baf5eee0a7a2579e501f69e37489202a2e5b647084cR228-R244

> Doesn't it looks like a bug? 

 _Originally posted by @Tigrov in [#545](https://github.com/yiisoft/active-record/pull/545/changes/BASE..dc1ccc01420b562a7c675b133c4e8847baa40fd6#r2993108930)_