fengyunhe commented on issue #5274:
URL: https://github.com/apache/shardingsphere/issues/5274#issuecomment-618153554
I tried to verify your problem. When I added a varchar type column at run
time, I would get an error when querying again, but when I restarted the Proxy,
the error disappeared.
console in log:
```
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Rule
Type: sharding
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Logic
SQL: select * from `order` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL -
SQLStatement:
SelectSQLStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.SelectStatement@4fd19152,
tablesContext=TablesContext(tables=[Table(name=order,
alias=Optional.absent())], schema=Optional.absent())),
projectionsContext=ProjectionsContext(startIndex=7, stopIndex=7,
distinctRow=false, projections=[ShorthandProjection(owner=Optional.absent())],
columnLabels=[id, user_id, fee, create_time]),
groupByContext=org.apache.shardingsphere.sql.parser.relation.segment.select.groupby.GroupByContext@411676d8,
orderByContext=org.apache.shardingsphere.sql.parser.relation.segment.select.orderby.OrderByContext@4529fa22,
paginationContext=org.apache.shardingsphere.sql.parser.relation.segment.select.pagination.PaginationContext@2b7ce3,
containsSubquery=false)
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds4 ::: select * from `order0` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds4 ::: select * from `order1` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds5 ::: select * from `order0` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds5 ::: select * from `order1` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds6 ::: select * from `order0` order by note desc limit 10
[INFO ] 03:14:11.766 [ShardingSphere-Command-21] ShardingSphere-SQL - Actual
SQL: ds6 ::: select * from `order1` order by note desc limit 10
[ERROR] 03:14:11.790 [ShardingSphere-Command-21]
o.a.s.s.f.c.CommandExecutorTask - Exception occur:
java.lang.NullPointerException: null
at
org.apache.shardingsphere.shardingproxy.backend.response.query.QueryHeader.<init>(QueryHeader.java:67)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.callback.ProxySQLExecuteCallback.getQueryHeaders(ProxySQLExecuteCallback.java:89)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.callback.ProxySQLExecuteCallback.executeSQL(ProxySQLExecuteCallback.java:81)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.callback.ProxySQLExecuteCallback.executeSQL(ProxySQLExecuteCallback.java:73)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.callback.ProxySQLExecuteCallback.executeSQL(ProxySQLExecuteCallback.java:45)
at
org.apache.shardingsphere.core.execute.sql.execute.SQLExecuteCallback.execute0(SQLExecuteCallback.java:79)
at
org.apache.shardingsphere.core.execute.sql.execute.SQLExecuteCallback.execute(SQLExecuteCallback.java:61)
at
org.apache.shardingsphere.core.execute.engine.ShardingExecuteEngine.syncGroupExecute(ShardingExecuteEngine.java:125)
at
org.apache.shardingsphere.core.execute.engine.ShardingExecuteEngine.parallelExecute(ShardingExecuteEngine.java:102)
at
org.apache.shardingsphere.core.execute.engine.ShardingExecuteEngine.groupExecute(ShardingExecuteEngine.java:83)
at
org.apache.shardingsphere.core.execute.sql.execute.SQLExecuteTemplate.executeGroup(SQLExecuteTemplate.java:73)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.execute.JDBCExecuteEngine.execute(JDBCExecuteEngine.java:82)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:99)
at
org.apache.shardingsphere.shardingproxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:84)
at
org.apache.shardingsphere.shardingproxy.backend.text.query.QueryBackendHandler.execute(QueryBackendHandler.java:54)
at
org.apache.shardingsphere.shardingproxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:73)
at
org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:92)
at
org.apache.shardingsphere.shardingproxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:72)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
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