ouyangyewei opened a new pull request #6560:
URL: https://github.com/apache/dolphinscheduler/pull/6560


   ```
   23:59:34.777 [main] ERROR 
org.apache.dolphinscheduler.dao.upgrade.shell.CreateDolphinScheduler - create 
DolphinScheduler failed
   java.lang.RuntimeException: You have an error in your SQL syntax; check the 
manual that corresponds to your MySQL server version for the right syntax to 
use near 'ALTER TABLE t_ds_task_definition drop INDEX `task_unique`;     END 
IF; END' at line 1
        at 
org.apache.dolphinscheduler.dao.upgrade.UpgradeDao.upgradeDolphinSchedulerDDL(UpgradeDao.java:505)
        at 
org.apache.dolphinscheduler.dao.upgrade.UpgradeDao.upgradeDolphinScheduler(UpgradeDao.java:270)
        at 
org.apache.dolphinscheduler.dao.upgrade.DolphinSchedulerManager.upgradeDolphinScheduler(DolphinSchedulerManager.java:117)
        at 
org.apache.dolphinscheduler.dao.upgrade.shell.CreateDolphinScheduler.main(CreateDolphinScheduler.java:41)
   Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL 
syntax; check the manual that corresponds to your MySQL server version for the 
right syntax to use near 'ALTER TABLE t_ds_task_definition drop INDEX 
`task_unique`;     END IF; END' at line 1
        at 
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:118)
        at 
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:95)
        at 
com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
        at 
com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:790)
        at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:675)
        at 
com.alibaba.druid.pool.DruidPooledStatement.execute(DruidPooledStatement.java:632)
        at 
org.apache.dolphinscheduler.common.utils.ScriptRunner.runScript(ScriptRunner.java:117)
        at 
org.apache.dolphinscheduler.common.utils.ScriptRunner.runScript(ScriptRunner.java:72)
        at 
org.apache.dolphinscheduler.dao.upgrade.UpgradeDao.upgradeDolphinSchedulerDDL(UpgradeDao.java:492)
        ... 3 common frames omitted
   ```


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