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TiCDC: Update unsupported scenarios in ticdc-overview.md #3552

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Expand Up @@ -53,7 +53,6 @@ TiCDC 的系统架构如下图所示：

目前 TiCDC（4.0 发布版本）与部分 TiDB 特性存在冲突，在后续的 TiCDC 版本上会逐渐修复。当前版本需要做相应的兼容性处理。暂不支持的场景如下：

- 暂不支持同步分区表。
- 暂不支持单独使用 RawKV 的 TiKV 集群。
- 暂不支持 TiDB 4.0 [新的 Collation 框架](/character-set-and-collation.md#新框架下的-collation-支持)。如果开启该功能，需保证下游集群为 TiDB 并使用与上游相同的 collation，否则会出现 collation 导致的无法定位数据的问题。
- 暂不支持 TiDB 4.0 中[创建 SEQUENCE 的 DDL 操作](/sql-statements/sql-statement-create-sequence.md) 和 [SEQUENCE 函数](/sql-statements/sql-statement-create-sequence.md#sequence-函数)。在上游 TiDB 使用 SEQUENCE 时，TiCDC 将会忽略掉上游执行的 SEQUENCE DDL 操作/函数，但是使用 SEQUENCE 函数的 DML 操作可以正确地同步。
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