RaigorJiang commented on issue #28872:
URL: 
https://github.com/apache/shardingsphere/issues/28872#issuecomment-1835381799

   > @RaigorJiang
   > 
   > Invalidation in complex nested queries.
   > 
   > such as
   > 
   > ```
   > select a.* from 
   > (
   >      /* SHARDINGSPHERE_HINT: B.SHARDING_DATABASE_VALUE=0, 
B.SHARDING_TABLE_VALUE=1 */
   >       select b.* from B
   > ) a 
   > left join C on a.id = C.id
   > left join D on a.id = D.id 
   > ```
   > 
   > complex nested queries like this have invalid table splitting strategies
   
   It seems that only header comments are supported now.


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