wangyum commented on issue #24798: [SPARK-27724][SQL] Implement REPLACE TABLE 
and REPLACE TABLE AS SELECT with V2
URL: https://github.com/apache/spark/pull/24798#issuecomment-510494241
 
 
   It seems only MariaDB support similar syntax. PostgreSQL, Vertica, Oracle, 
SQL Server, DB2 and MySQL does not support this syntax:
   ```sql
   MariaDB [test]> CREATE OR REPLACE TABLE spark_27724 as select 1;
   Query OK, 1 row affected (0.011 sec)
   Records: 1  Duplicates: 0  Warnings: 0
   ```

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