[GitHub] [shardingsphere] FlyingZC opened a new issue, #27048: Support parsing Oracle CREATE MATERIALIZED sql

[via GitHub]

FlyingZC opened a new issue, #27048:
URL: https://github.com/apache/shardingsphere/issues/27048

   # Background
   Hi community,
   This issue is for #26878.
   
   ShardingSphere parser engine helps users parse a SQL to get the AST 
(Abstract Syntax Tree) and visit this tree to get SQLStatement (Java Object). 
Currently, we are planning to enhance the support for Oracle SQL parsing in 
ShardingSphere.
   
   More details:
   
https://shardingsphere.apache.org/document/current/en/reference/sharding/parse/
   
   # Task
   This issue is to support more oracle sql parse, as follows:
   ```sql
   CREATE MATERIALIZED VIEW oe.people_reltab_mv
      NESTED TABLE phones_ntab STORE AS phone_store_ntab_mv 
      REFRESH FAST AS SELECT * FROM oe.people_rel...@orc1.example.com;
   ```
   
   ```sql
   CREATE MATERIALIZED VIEW order_data REFRESH WITH ROWID 
      AS SELECT * FROM orders;
   ```
   
   ```sql
   CREATE MATERIALIZED VIEW sum_sales_per_city_2_mv
   ENABLE QUERY REWRITE AS
   SELECT DBMS_MVIEW.PMARKER(s.rowid) AS pmarker,
          t.fiscal_quarter_desc, p.prod_subcategory, c.cust_city,
          SUM(s.amount_sold) AS sum_amount_sold
   FROM sales s, products p, customers c, times t
   WHERE s.cust_id = c.cust_id AND s.prod_id = p.prod_id
   AND   s.time_id = t.time_id
   GROUP BY DBMS_MVIEW.PMARKER(s.rowid),
       p.prod_subcategory, c.cust_city, t.fiscal_quarter_desc;
   ```
   
   ```sql
   CREATE MATERIALIZED VIEW oe.product_information REFRESH FAST FOR UPDATE AS
    SELECT * FROM oe.product_informat...@orc1.example.com pi
    WHERE pi.category_id = 29 AND EXISTS
     (SELECT * FROM oe.product_descripti...@orc1.example.com pd
     WHERE pi.product_id = pd.product_id AND 
           pd.translated_description LIKE '%Rouge%')  
   UNION
    SELECT * FROM oe.product_informat...@orc1.example.com pi
    WHERE pi.category_id = 29 AND EXISTS
     (SELECT * FROM oe.inventor...@orc1.example.com i
     WHERE pi.product_id = i.product_id AND EXISTS
       (SELECT * FROM oe.warehou...@orc1.example.com w
       WHERE i.warehouse_id = w.warehouse_id AND EXISTS
         (SELECT * FROM hr.locati...@orc1.example.com l
          WHERE w.location_id = l.location_id 
          AND l.state_province = 'California')));
   ```
   
   ```sql
   CREATE MATERIALIZED VIEW product_sales_mv
   PCTFREE 0 TABLESPACE demo
   STORAGE (INITIAL 8M)
   BUILD DEFERRED
   REFRESH COMPLETE ON DEMAND
   ENABLE QUERY REWRITE AS
   SELECT p.prod_name, SUM(s.amount_sold) AS dollar_sales
   FROM sales s, products p WHERE s.prod_id = p.prod_id
   GROUP BY p.prod_name;
   ```
   
   # Process
   1. First confirm that this is a correct oracle sql syntax, if not please 
ignore;
   2. Compare SQL definitions in Oficial SQL Doc and ShardingSphere SQL Doc;
   3. If there is any difference in ShardingSphere SQL Doc, please correct them 
by referring to the Official SQL Doc;
   4. Run mvn install the current_file_module;
   5. Check whether there are any exceptions. If indeed, please fix them. 
(Especially xxxVisitor.class);
   6. Add new corresponding SQL case in SQL Cases and expected parsed result in 
Expected Statment XML;
   7. Run SQLParserParameterizedTest to make sure no exceptions.
   
   # Relevant Skills
   1. Master JAVA language
   2. Have a basic understanding of Antlr `g4` file
   3. Be familiar with Oracle SQLs


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