TeslaCN commented on issue #19566:
URL: 
https://github.com/apache/shardingsphere/issues/19566#issuecomment-1199075030

   Throwing TableModifyInTransactionException is because PostgreSQL can 
rollback DDL like the following:
   ```sql
   begin;
   drop table t;
   rollback;
   ```
   But ShardingSphere's meta data cannot be rollback.
   If `truncate` won't change the meta data, may be we could allow it could be 
executed in transaction.


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