RaigorJiang commented on issue #16180:
URL: 
https://github.com/apache/shardingsphere/issues/16180#issuecomment-1073429695


   Hi @zhouyouwei-0127 @zjcnb 
   If you add a new table directly on the underlying database, or modify the 
table structure, it will not trigger the metadata refresh in Proxy. This is by 
design and should not be considered a bug.
   It is recommended to execute DDL statements through Proxy.
   
   In addition, there is some syntax in DistSQL RAL, which can help users to 
actively trigger metadata refresh in this case:
   - `refresh table metadata`
   - `show table metadata tableName`


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