FlyingZC opened a new issue, #27057: URL: https://github.com/apache/shardingsphere/issues/27057
# 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 OR REPLACE FUNCTION factorial ( n POSITIVE ) RETURN POSITIVE IS BEGIN IF n = 1 THEN -- terminating condition RETURN n; ELSE RETURN n * factorial(n-1); -- recursive invocation END IF; END; ``` ```sql CREATE OR REPLACE FUNCTION getXML(pathname VARCHAR2, charset VARCHAR2) RETURN BLOB IS xblob BLOB; BEGIN SELECT XMLSERIALIZE(DOCUMENT e.RES AS BLOB ENCODING charset) INTO xblob FROM RESOURCE_VIEW e WHERE equals_path(e.RES, pathname) = 1; RETURN xblob; END; ``` ```sql CREATE OR REPLACE FUNCTION fibonacci (n NUMBER) RETURN NUMBER RESULT_CACHE IS BEGIN IF (n =0) OR (n =1) THEN RETURN 1; ELSE RETURN fibonacci(n - 1) + fibonacci(n - 2); END IF; END; ``` ```sql CREATE OR REPLACE FUNCTION get_hire_date (emp_id NUMBER, fmt VARCHAR) RETURN VARCHAR RESULT_CACHE IS date_hired DATE; BEGIN SELECT hire_date INTO date_hired FROM HR.EMPLOYEES WHERE EMPLOYEE_ID = emp_id; RETURN TO_CHAR(date_hired, fmt); END; ``` ```sql CREATE OR REPLACE FUNCTION get_hire_date (emp_id NUMBER) RETURN VARCHAR RESULT_CACHE IS date_hired DATE; BEGIN SELECT hire_date INTO date_hired FROM HR.EMPLOYEES WHERE EMPLOYEE_ID = emp_id; RETURN TO_CHAR(date_hired); END; ``` # 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 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
