lanchengx opened a new issue #15275:
URL: https://github.com/apache/shardingsphere/issues/15275


   Hi community,
   this issue is for a new DistSQL syntax.
   
   **Background**
   > Currently, there is already a `show schema rules` syntax for querying the 
number of rules in a schema, but it is still troublesome to get the number of 
rules in an instance when there are multiple schemas.
   
   So we intend to provide a syntax for querying all rules in an instance.
   
   **Aim**
   
   | feature  |type  | count
   | ----     | ---- |---- |
   | single_table |table |  2  |
   | sharding     |sharding_table |  2  |
   | sharding |binding_table |  1  |
   | sharding |broadcast_table |  0  |
   | readwrite_splitting |datasource |  1  |
   | db_discovery |datasource |  0  |
   | encrypt  | table |0  |
   | shadow  | datasource |0  |
   
   The syntax is as follows:
   
   ```mysql
   COUNT INSTANCE RULES;
   ```
   
   _Tip: You can refer to the `count schema rules` syntax_
   


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