strongduanmu opened a new pull request #14787:
URL: https://github.com/apache/shardingsphere/pull/14787


   Ref #10797.
   
   Changes proposed in this pull request:
   - fix integration test error for empty_rules scenario
   
   ```
   Error:  2022-01-14 12:23:12.074 [main] o.a.s.t.i.junit.watcher.ITWatcher - 
Error case: assertExecute[proxy: empty_rules -> MySQL -> Literal -> PREVIEW 
SELECT * FROM t_single_table s INNER JOIN t_user_item i ON s.single_id = 
i.item_id WHERE i.user_id = 1], message: java.sql.SQLException: Runtime 
exception: [All tables must be in the same datasource.]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2491)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2449)
        at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1381)
        at 
com.zaxxer.hikari.pool.ProxyStatement.executeQuery(ProxyStatement.java:111)
        at 
com.zaxxer.hikari.pool.HikariProxyStatement.executeQuery(HikariProxyStatement.java)
        at 
org.apache.shardingsphere.test.integration.engine.it.ral.GeneralRALIT.assertExecuteForStatement(GeneralRALIT.java:74)
        at 
org.apache.shardingsphere.test.integration.engine.it.ral.GeneralRALIT.assertExecute(GeneralRALIT.java:67)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at 
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at 
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at 
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at 
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
        at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
        at 
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.junit.runners.Suite.runChild(Suite.java:128)
        at org.junit.runners.Suite.runChild(Suite.java:27)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:383)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:344)
        at 
org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:125)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:417)
   ```


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