show table status will get the incorrect memory usage for mulltiple replicas

Now we use "show table status" and get the incorrect memory usage.

The issue mentions 'show table status' returning incorrect memory usage for multiple replicas. Look for SQL command handling and memory usage tracking in the codebase, likely in the SQL execution or replication modules. Check existing tests for 'show table status' to understand the expected behavior. The fix will involve updating the memory calculation logic to account for replicas correctly.

由索引模型根据 Issue 内容生成。