wsm12138 opened a new issue, #20458:
URL: https://github.com/apache/shardingsphere/issues/20458
## Bug Report
### Which version of ShardingSphere did you use?
```
ShardingSphere-5.1.3-SNAPSHOT
Commit ID: 39850eb7a188b59fbcf65fb55b098b07b7f6132f
Commit Message: Improve migration data consistency checker. (#20407)
Branch: 39850eb7a188b59fbcf65fb55b098b07b7f6132f
Build time: 2022-08-23T11:32:37+0800
```
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
*ShardingSphere-Proxy*
### Expected behavior
```
mysql> select count(*) from t_order;
+----------+
| count(*) |
+----------+
| 5 |
+----------+
1 row in set (0.09 sec)
```
### Actual behavior
```
mysql> show migration status 'j012f8ae37064557dd75569db498cb3ba8c';
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
| item | data_source | status | active |
inventory_finished_percentage | incremental_idle_seconds |
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
| 0 | source_ds | EXECUTE_INCREMENTAL_TASK | true | 100
| 28 |
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
1 row in set (0.03 sec)
mysql> show migration status 'j012f8ae37064557dd75569db498cb3ba8';
ERROR 16000 (HY000): Can not find pipeline job
`j012f8ae37064557dd75569db498cb3ba8`
mysql> select count(*) from t_order;
ERROR 30000 (42000): Unknown exception: null
mysql> select count(*) from t_order;
ERROR 30000 (42000): Unknown exception: null
mysql> show tables;
Empty set (0.00 sec)
mysql> show migration status 'j012f8ae37064557dd75569db498cb3ba8';
ERROR 16000 (HY000): Can not find pipeline job
`j012f8ae37064557dd75569db498cb3ba8`
mysql> show migration status 'j012f8ae37064557dd75569db498cb3ba8c';
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
| item | data_source | status | active |
inventory_finished_percentage | incremental_idle_seconds |
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
| 0 | source_ds | EXECUTE_INCREMENTAL_TASK | true | 100
| 92 |
+------+-------------+--------------------------+--------+-------------------------------+--------------------------+
1 row in set (0.01 sec)
```
### Reason analyze (If you can)
stdout.log
```
[ERROR] 2022-08-23 16:43:18.822 [ShardingSphere-Command-7]
o.a.s.p.f.c.CommandExecutorTask - Exception occur:
java.lang.NullPointerException: null
at
org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.getValueCaseSensitiveFromTables(GroupByMemoryMergedResult.java:135)
at
org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.getValueCaseSensitive(GroupByMemoryMergedResult.java:125)
at
org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.init(GroupByMemoryMergedResult.java:73)
at
org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.init(GroupByMemoryMergedResult.java:53)
at
org.apache.shardingsphere.infra.merge.result.impl.memory.MemoryMergedResult.<init>(MemoryMergedResult.java:51)
at
org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.<init>(GroupByMemoryMergedResult.java:56)
at
org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.getGroupByMergedResult(ShardingDQLResultMerger.java:118)
at
org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.build(ShardingDQLResultMerger.java:88)
at
org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.merge(ShardingDQLResultMerger.java:66)
at
org.apache.shardingsphere.infra.merge.MergeEngine.executeMerge(MergeEngine.java:82)
at
org.apache.shardingsphere.infra.merge.MergeEngine.merge(MergeEngine.java:71)
at
org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.mergeQuery(DatabaseCommunicationEngine.java:177)
at
org.apache.shardingsphere.proxy.backend.communication.DatabaseCommunicationEngine.processExecuteQuery(DatabaseCommunicationEngine.java:143)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:136)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:94)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:110)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run(CommandExecutorTask.java:77)
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)
```
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
1. start proxy with cluster mode
2. create logic db;add resource in logic db.
3. execute `MIGRATE TABLE source_ds.t_order INTO sharding_db.t_order;`
4. execute `select count(*) from table` during MIGRATE;execute `select *
from table` during MIGRATE
### Example codes for reproduce this issue (such as a github link).
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