lancelly opened a new pull request, #27614:
URL: https://github.com/apache/shardingsphere/pull/27614

   In this pr, I supported parsing of the following SQLs:
   ``` SELECT customer_id, cust_address_ntab MULTISET EXCEPT DISTINCT 
cust_address2_ntab multiset_except FROM customers_demo ORDER BY customer_id;```
   
   ``` SELECT customer_id, cust_address_ntab MULTISET INTERSECT DISTINCT 
cust_address2_ntab multiset_intersect FROM customers_demo ORDER BY 
customer_id;```
   
   ```SELECT customer_id, cust_address_ntab MULTISET UNION cust_address2_ntab 
multiset_union FROM customers_demo ORDER BY customer_id;```
   Reference could be found at: 
https://docs.oracle.com/cd/B13789_01/server.101/b10759/operators006.htm


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