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【DM版本】:8
【操作系统】：linux
【CPU】:8
【问题描述】*：执行批量插入sql时，报Too many nested levels

达梦数据库配置的是兼容Oracle，批量插入sql如下：
insert into station_func_temp (id, station_id, func_id) select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual union all select ?, ?, ? from dual…

Sql太长，用省略号略去。大概有 875个union all

如果只有几个union all的时候，批量新增的sql是可以执行的，不会报错

报错信息：
2022-08-19T06:18:37.815545109Z org.springframework.dao.DataIntegrityViolationException:
2022-08-19T06:18:37.815547898Z ### Error updating database. Cause: dm.jdbc.driver.DMException: Error in line: 3510
2022-08-19T06:18:37.815550018Z Too many nested levels