[BUG] JSQLParser 4.7: ADD COLUMN IF NOT EXISTS not supported

[zdhuangelephant]

Always check against the Latest SNAPSHOT of JSQLParser and the Syntax Diagram

Failing SQL Feature:

• Brief description of the failing SQL feature

• Example: Encountered unexpected token: "IF" "IF" can't be parsed

• run java `static void buildCCJSqlParser() throws IOException, JSQLParserException {

    final Path path = Paths.get("/Users/xxx/xxx", "xxx-xxx-comm.sql");
    final byte[] bytes = Files.readAllBytes(path);
  
    ExecutorService executorService = Executors.newSingleThreadExecutor();
  
    final CCJSqlParser ccjSqlParser = CCJSqlParserUtil.newParser(new ByteArrayInputStream(bytes), StandardCharsets.UTF_8.name());
    final Statements statements = CCJSqlParserUtil.parseStatements(ccjSqlParser, executorService);
  
    final int[] updateCounter = {0};
    final int[] alterCounter = {0};
    final int[] selectCounter = {0};
    StatementVisitorAdapter adapter = new StatementVisitorAdapter(){
        @Override
        public void visit(Update update) {
            final String name = update.getTable().getName();
            final String schemaName = update.getTable().getSchemaName();
  
            updateCounter[0]++;
            System.out.printf("Update: table:%s, schema:%s%n", name, schemaName);
        }
        @Override
        public void visit(Alter alter) {
            final String name = alter.getTable().getName();
            final String schemaName = alter.getTable().getSchemaName();
  
            alterCounter[0]++;
            System.out.printf("Update: table:%s, schema:%s%n", name, schemaName);
        }
    };
    statements.accept(adapter);
  
    System.out.println(updateCounter[0] + ", " + alterCounter[0] + ", " + selectCounter[0]);
  

  }`

SQL Example:

• Simplified Query Example, focusing on the failing feature

  -- Replace with your ACTUAL example
  ALTER TABLE IF EXISTS usercenter.dict_surgeries ADD COLUMN IF NOT EXISTS operation_grade_id int8 NULL;

Software Information:

• JSqlParser version 4.7
• Database (PostgreSQL )

Tips:

Please write in English and avoid Screenshots (as we can't copy and paste content from it).
Try your example online with the latest JSQLParser and share the link in the error report.
Do provide Links or References to the specific Grammar and Syntax you are trying to use.

[manticore-projects]

Greetings,

the IF NOT EXISTS clause is not supported for ADD COLUMN.

You can try it online here.

Reference to the supported SQL Syntax.

In my opinion all the DDL statements deserve a proper refactoring and we are looking for Sponsors or Volunteers.

[zdhuangelephant]

thank you for your time to reply this question.
the volunteers? it's excited when i as a committer

[manticore-projects]

the volunteers? it's excited when i as a committer

Please follow the guide: https://manticore-projects.com/JSQLParser/contribution.html
We will be most excited to welcome you as a new contributor. Fell very welcome to ask any questions.

[jxnu-liguobin]

Seems to require refactoring for add alter modify drop column