feat(stonedb): Fix the crash in Query::Compile due to accessing nullptr

[andyli029]

Is your feature request related to a problem? Please describe.

TODO:
Need to verify: sl->join and handle it:

    if (!sl->join)
		{
// stonedb8 start
      TIANMU_LOG(LogCtl_Level::ERROR, "sl->join is nil!!!!");

//            sl->add_active_options(SELECT_NO_UNLOCK);
//            JOIN *join = new JOIN(sl->master_unit()->thd, sl);
//
//            if (!join) {
//
//                sl->cleanup(0);
//                return true;
//            }
//            sl->set_join(join);
// stonedb8 end

In stonedb 5.7, we createa a new join object, but we still do not know the root cause why join is a null object. Therefore, here, we do not new a new join object to find the root cause. 

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[RingsC]

We will delete the added codes to find out the root cause: why join is nullptr.