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:

CREATE TABLE persons OF person
  ( homeaddress NOT NULL,
      UNIQUE (homeaddress.phone),
      CHECK (homeaddress.zip IS NOT NULL),
      CHECK (homeaddress.city <> 'San Francisco') );

CREATE TABLE pivotedTable AS
SELECT *
FROM (SELECT product, quarter, quantity_sold, amount_sold
      FROM sales_view)
    PIVOT
    (
       SUM(quantity_sold) AS sumq, SUM(amount_sold) AS suma
       FOR quarter IN ('01' AS Q1, '02' AS Q2, '03' AS Q3, '04' AS Q4));

CREATE TABLE projecttab(deptno NUMBER, project HR.PROJECT_T)

CREATE TABLE people_reltab (
  id            NUMBER(4)   CONSTRAINT pk_people_reltab PRIMARY KEY,
  employee      employee_objtyp
  phones_ntab   phone_ntabtyp)
  NESTED TABLE  phones_ntab STORE AS phone_store_ntab;

CREATE TABLE po_binaryxml OF XMLType
  XMLTYPE STORE AS BINARY XML
  VIRTUAL COLUMNS
    (DATE_COL AS (XMLCast(XMLQuery('/PurchaseOrder/@orderDate'
                                   PASSING OBJECT_VALUE RETURNING CONTENT)
                          AS DATE)))
  PARTITION BY RANGE (DATE_COL)
    (PARTITION orders2001 VALUES LESS THAN (to_date('01-JAN-2002')),
     PARTITION orders2002 VALUES LESS THAN (MAXVALUE));

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