这周么搞个了 Canal Adapter 同步 es。有个问题关于字段 key 大小写的问题基于什么考量，还是我还有没看到的地方

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这是一个创建于 40 天前的主题，其中的信息可能已经有所发展或是发生改变。

DML: {"data":[{"ID":"01238f0d262106456d3a864247117b48","LOGIN_NAME":"ttt","USERNAME":"tt"}],"database":"zzcm","destination":"example","es":1731220850000,"groupId":"g1","isDdl":false,"old":[{"LOGIN_NAME":"tttt"}],"pkNames":["ID"],"sql":"","table":"sys_user","ts":1731220854645,"type":"UPDATE"}

DML: {"data":[{"ID":"01238f0d262106456d3a864247117b46","LOGIN_NAME":"tttt","USERNAME":"tt"}],"database":"zzcm","destination":"example","es":1731221326000,"groupId":"g1","isDdl":false,"old":null,"pkNames":["ID"],"sql":"","table":"sys_user","ts":1731221327113,"type":"DELETE"}

DML: {"data":[{"ID":"01238f0d262106456d3a864247117b99","LOGIN_NAME":"tttt","USERNAME":"tt"}],"database":"zzcm","destination":"example","es":1731221336000,"groupId":"g1","isDdl":false,"old":null,"pkNames":["ID"],"sql":"","table":"sys_user","ts":1731221336823,"type":"INSERT"}

DML 里面字段 key 大写；表名小写；

需要和配置 sql 大小写吻合才行（这个稍不注意有些数据就不合适和匹配不上了还不报错！！！）。

还有指定的 id/pk 也是大小写吻合。

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