somnuscq edited a comment on issue #8038:
URL: https://github.com/apache/shardingsphere/issues/8038#issuecomment-722174798
```
java.lang.NullPointerException: null
at
org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.getOrderValuesCaseSensitiveFromTables(OrderByValue.java:75)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.getOrderValuesCaseSensitive(OrderByValue.java:65)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByValue.<init>(OrderByValue.java:58)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByStreamMergedResult.orderResultSetsToQueue(OrderByStreamMergedResult.java:56)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.orderby.OrderByStreamMergedResult.<init>(OrderByStreamMergedResult.java:50)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.build(ShardingDQLResultMerger.java:85)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.merge(ShardingDQLResultMerger.java:63)
~[sharding-core-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.underlying.merge.MergeEntry.merge(MergeEntry.java:85)
~[shardingsphere-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.underlying.merge.MergeEntry.process(MergeEntry.java:75)
~[shardingsphere-merge-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.underlying.pluggble.merge.MergeEngine.merge(MergeEngine.java:61)
~[shardingsphere-pluggable-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.mergeQuery(ShardingPreparedStatement.java:190)
~[sharding-jdbc-core-4.1.1.jar:4.1.1]
at
org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.getResultSet(ShardingPreparedStatement.java:158)
~[sharding-jdbc-core-4.1.1.jar:4.1.1]
at
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getFirstResultSet(DefaultResultSetHandler.java:239)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:189)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
~[mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
~[mybatis-3.4.6.jar:3.4.6]
at
com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:108)
~[pagehelper-5.1.8.jar:na]
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
~[mybatis-3.4.6.jar:3.4.6]
at com.sun.proxy.$Proxy166.query(Unknown Source) ~[na:na]
at
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
~[mybatis-3.4.6.jar:3.4.6]
at
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
~[mybatis-3.4.6.jar:3.4.6]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[na:1.8.0_171]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[na:1.8.0_171]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:1.8.0_171]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171]
at
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
~[mybatis-spring-1.3.2.jar:1.3.2]
at com.sun.proxy.$Proxy123.selectList(Unknown Source) ~[na:na]
at
org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
~[mybatis-spring-1.3.2.jar:1.3.2]
at
org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139)
~[mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76)
~[mybatis-3.4.6.jar:3.4.6]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
~[mybatis-3.4.6.jar:3.4.6]
at com.sun.proxy.$Proxy124.list(Unknown Source) ~[na:na]
```
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