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 time_table
  (start_time    TIMESTAMP,
   duration_1    INTERVAL DAY (6) TO SECOND (5),
   duration_2    INTERVAL YEAR TO MONTH);

CREATE TABLESPACE MTS2 DATAFILE '/dev/raw/raw100' size 1m;
Tablespace created.
 
ALTER SYSTEM SWITCH LOGFILE;

CREATE TABLESPACE MTS3 DATAFILE '/dev/raw/raw101' size 1m;
Tablespace created.
 
ALTER SYSTEM SWITCH LOGFILE;

CREATE TABLESPACE apps_tbs LOGGING 
     DATAFILE '/u01/app/oracle/oradata/mynewdb/apps01.dbf' 
     SIZE 500M REUSE AUTOEXTEND ON NEXT  1280K MAXSIZE UNLIMITED 
     EXTENT MANAGEMENT LOCAL;
-- create a tablespace for indexes, separate from user tablespace (optional)
CREATE TABLESPACE indx_tbs LOGGING 
     DATAFILE '/u01/app/oracle/oradata/mynewdb/indx01.dbf' 
     SIZE 100M REUSE AUTOEXTEND ON NEXT  1280K MAXSIZE UNLIMITED 
     EXTENT MANAGEMENT LOCAL;

CREATE TABLE transactions
( id               NUMBER
, transaction_date DATE
, value            NUMBER
)
PARTITION BY RANGE (transaction_date)
INTERVAL (NUMTODSINTERVAL(1,'DAY'))
( PARTITION p_before_2007 VALUES LESS THAN (TO_DATE('01-JAN-2007','dd-MON-yyyy')));

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