是否可以在spring数据的@query注解中使用mysql用户定义变量？
编辑：这是我当前的代码：

@Query( value = "select case when (?2 = 0) then -1 when ((@cd:=(select count(*) + 1 from test.stats where " +
            "points = ?2)) <= 2) then (@cd) else (@cd + (select count(*) from test.stats where points = ?2 and " +
            "uuid > ?1)) end as rank from test.stats where uuid = ?1;", nativeQuery = true )
    Integer getRank( String uuid, Integer points );

@cd:=。。。似乎是错误，但我怎么能改正呢？以下是完整的堆栈跟踪：

org.hibernate.QueryException: Space is not allowed after parameter prefix ':' [select case when (?2 = 0) then -1 when ((@cd:=(select count(*) + 1 from test.stats where points = ?2)) <= 2) then (@cd) else (@cd + (select count(*) from test.stats where points = ?2 and uuid > ?1)) end as rank from test.stats where uuid = ?1;]
    at org.hibernate.engine.query.spi.ParameterParser.parse(ParameterParser.java:173) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.engine.query.spi.ParamLocationRecognizer.parseLocations(ParamLocationRecognizer.java:59) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.engine.query.internal.NativeQueryInterpreterStandardImpl.getParameterMetadata(NativeQueryInterpreterStandardImpl.java:34) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.engine.query.spi.QueryPlanCache.getSQLParameterMetadata(QueryPlanCache.java:128) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.internal.AbstractSharedSessionContract.getNativeQueryImplementor(AbstractSharedSessionContract.java:951) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.internal.AbstractSharedSessionContract.createNativeQuery(AbstractSharedSessionContract.java:874) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at org.hibernate.internal.AbstractSessionImpl.createNativeQuery(AbstractSessionImpl.java:23) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:350) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at com.sun.proxy.$Proxy101.createNativeQuery(Unknown Source) ~[na:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:304) ~[spring-orm-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at com.sun.proxy.$Proxy101.createNativeQuery(Unknown Source) ~[na:na]
    at org.springframework.data.jpa.repository.query.NativeJpaQuery.createJpaQuery(NativeJpaQuery.java:75) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractStringBasedJpaQuery.doCreateQuery(AbstractStringBasedJpaQuery.java:82) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.createQuery(AbstractJpaQuery.java:210) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:214) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:91) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:136) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:125) ~[spring-data-jpa-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:590) ~[spring-data-commons-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578) ~[spring-data-commons-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59) ~[spring-data-commons-2.0.7.RELEASE.jar:2.0.7.RELEASE]
    at

完整堆栈跟踪太大，因此链接如下：https://pastebin.com/73nerhdb