[I] seata 1.8版本 在全局事务回滚时候，在通过pkColumnValueList获取Field出现数组下表越界，因为undo log中联合主键中的某个字段会出现多次，麻烦哪位大佬看到了帮看下具体是什么原因？ [incubator-seata]

[via GitHub]

zhanhw opened a new issue, #6535:
URL: https://github.com/apache/incubator-seata/issues/6535

   我们业务中的一张主表是联合主键的（ id，fk_cust_id,billing_date） ，在业务报错全局事务回滚的时候，我们发现undo log中的 
镜像数据里面的filed里面 联合主键中的某一个字段 fk_cust_id 出现了两次，这个会导致 我下面截图中的这部分代码 
通过pkColumnValueList获取Field 会出现数组下标越界 Index: 1, Size: 1，因为前面的rowSize 
取的是第一个pkNameList的值，第一个pkName就是 fk_cust_id 它的size=2，而其它的size=1 
所以会出现数组下标越界，我想问下，为什么这种情况写入的undo log中会出现两个fk_cust_id字段 都是主键类型？
   
![undoLog](https://github.com/apache/incubator-seata/assets/37291088/900f25af-b4ef-4264-8678-899e87e49c5e)
   
![源码](https://github.com/apache/incubator-seata/assets/37291088/f241e6f3-fd7f-4736-8710-1598080c4025)
   
![联合主键](https://github.com/apache/incubator-seata/assets/37291088/f5871e12-7912-41db-9199-8e9fbfe75b84)
   
![lock详情](https://github.com/apache/incubator-seata/assets/37291088/0a043ef1-0f6d-45fa-a469-0e0dd6eda1eb)
   
![数组下表越界异常](https://github.com/apache/incubator-seata/assets/37291088/59a74c5b-870e-44d5-9a4e-714cb4dc1510)
   
   
   


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