GBase8a MPP的Express引擎不支持某些语法时

问题：

The query includes syntax that is not supported by the Express engine. Either restructure the query with supported syntax, or enable the GBase Query Path in the configuration file to execute the query with reduced performance.

解决：

set _gbase_query_path=1;

/*允许不支持 Express 引擎的查询走标准引擎*/