strongduanmu opened a new issue, #28754:
URL: https://github.com/apache/shardingsphere/issues/28754

   ## Background
   
   On the master branch, 
[SQLNodeConverterEngine](https://github.com/apache/shardingsphere/blob/master/kernel/sql-federation/core/src/main/java/org/apache/shardingsphere/sqlfederation/compiler/converter/SQLNodeConverterEngine.java)
 already supports the conversion of most SelectStatement statements, which 
provides a good foundation for sql federation. In order to improve the support 
of sql federation for merge statement, we need to support the conversion of 
MergeStatement in SQLNodeConverterEngine.
   
   Oracle merge statement doc - 
https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/MERGE.html#GUID-5692CCB7-24D9-4C0E-81A7-A22436DC968F
   
   ## Task
   
   - [ ] add DropTableStatementConverter implement, you can refer - 
https://github.com/polardb/polardbx-sql/blob/cdd976850bdfc3264dff279198b6b06eb8641fbe/polardbx-optimizer/src/main/java/com/alibaba/polardbx/optimizer/parse/visitor/FastSqlToCalciteNodeVisitor.java#L786
   - [ ] add DropTableStatementConverter call logic in SQLNodeConverterEngine
   - [ ] add drop table statement convert test case in `resources/converter` 
directory
   


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