### Error querying database.  Cause: dm.jdbc.driver.DMException: Error in line: 9
Member access [IF] unresolved
### The error may exist in class path resource [mapper/EntBasicMapper.xml]
### The error may involve com.gyyt.linan.mapper.EntBasicMapper.totalEnterpriseStatisticalIndicators
### The error occurred while executing a query
### SQL: SELECT          count(if(geb.ent_rule = 0, 1, null)) as "规上企业数"       FROM         (select * from gyyt_ent         WHERE delete_status=0                      and data_year = ?  GROUP BY credit_code ) geb
### Cause: dm.jdbc.driver.DMException: Error in line: 9
Member access [IF] unresolved
; Error in line: 9
Member access [IF] unresolved; nested exception is dm.jdbc.driver.DMException: Error in line: 9
Member access [IF] unresolved

版本：V8
测试环境没有报错，线上运行报这个，
这个是什么原因呢 ，没有if函数？