zhengyunpengby commented on issue #10929:
URL:
https://github.com/apache/shardingsphere/issues/10929#issuecomment-866484935
异常信息：
`Caused by: java.lang.NullPointerException: null
at
org.apache.shardingsphere.core.execute.sql.execute.row.QueryRow$1.apply(QueryRow.java:82)
at
org.apache.shardingsphere.core.execute.sql.execute.row.QueryRow$1.apply(QueryRow.java:78)
at
com.google.common.collect.Lists$TransformingRandomAccessList$1.transform(Lists.java:616)
at
com.google.common.collect.TransformedIterator.next(TransformedIterator.java:47)
at java.util.AbstractList.hashCode(AbstractList.java:540)
at
org.apache.shardingsphere.core.execute.sql.execute.row.QueryRow.hashCode(QueryRow.java:84)
at java.util.HashMap.hash(HashMap.java:339)
at java.util.HashMap.put(HashMap.java:612)
at java.util.HashSet.add(HashSet.java:220)
at
org.apache.shardingsphere.core.execute.sql.execute.result.DistinctQueryResult.fill(DistinctQueryResult.java:87)
at
org.apache.shardingsphere.core.execute.sql.execute.result.DistinctQueryResult.getResultData(DistinctQueryResult.java:76)
at
org.apache.shardingsphere.core.execute.sql.execute.result.DistinctQueryResult.<init>(DistinctQueryResult.java:63)
at
org.apache.shardingsphere.core.merge.dql.DQLMergeEngine.getRealQueryResults(DQLMergeEngine.java:85)
at
org.apache.shardingsphere.core.merge.dql.DQLMergeEngine.<init>(DQLMergeEngine.java:71)
at
org.apache.shardingsphere.core.merge.MergeEngineFactory.newInstance(MergeEngineFactory.java:58)
at
org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.getResultSet(ShardingPreparedStatement.java:139)
at
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getFirstResultSet(DefaultResultSetHandler.java:235)
at
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:185)
at
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
at
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
at sun.reflect.GeneratedMethodAccessor236.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
at com.sun.proxy.$Proxy276.query(Unknown Source)
at
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
at
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
at
com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:143)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
at com.sun.proxy.$Proxy275.query(Unknown Source)
at
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
... 23 common frames omitted`
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