`ALTER TABLE … MODIFY … ENUM('<reserved_keyword>')` is being wrongly parsed.

[niconoe-]

When trying to parse a statement like this:

ALTER TABLE `MY_TABLE` 
MODIFY `FOO` INT(11) NULL,
MODIFY `MY_COLUMN` ENUM('INSERT','UPDATE','DELETE','REPLACE') NULL,
MODIFY `BAR` VARCHAR(255) NULL;

SQL-Parser fails because it considers each value of the enum as a real keyword, instead of a simple string. Hence, next operations on the ALTER TABLE statements are not understood correctly, and it makes fail the parser.
This causes:

#n: A new statement was found, but no delimiter between it and the previous one. (near "'INSERT'" at position xxx)

Thanks 🙂

[williamdes]

Could be related to #450 and it's fix

[niconoe-]

This occurs on the latest version of sql-parser (5.8.0 as of today), so either this is not fixed, not related to #450, nor the fix is not yet released 🙂

I'm not sure this is related TBH, as OP of #450 talked about missing commas, while my issue here is really about the parser (or the lexer?) not being aware that the strings in the ENUM are actually not reserved symbols or keywords for statements.

[Tithugues]

Could be related to #450 and it's fix

Did I break something? 😅

[williamdes]

Well, more tests are needed to know for sure ^^

[niconoe-]

Some tests are added in #485 's 1st commit to show that using values in the ENUM like "TABLE" or "INSERT" are generating a parsing error.
The 2nd commit fixes that unwanted behavior and shows that the parser no longer have any error.

[niconoe-]

Ok, wait a minute, I screwed up something.

I just forgot to add the unit tests dataset I created 😅 . After actually adding them, the fix doesn't work.

That is because we are entering the if(! empty(Parser::$statementParsers[$token->value])) when doing the "SET", but not the "ENUM", and that is because "SET" is also a statement keyword, while "ENUM" is not…

We are just "lucky" to enter in this "if" block when using "SET" as a type, making no difference between "SET" as a type, and "SET" as a statement.

I'll fix that in a moment.

[niconoe-]

Ok, wait a minute, I screwed up something.

I just forgot to add the unit tests dataset I created sweat_smile . After actually adding them, the fix doesn't work.

That is because we are entering the if(! empty(Parser::$statementParsers[$token->value])) when doing the "SET", but not the "ENUM", and that is because "SET" is also a statement keyword, while "ENUM" is not…

We are just "lucky" to enter in this "if" block when using "SET" as a type, making no difference between "SET" as a type, and "SET" as a statement.

I'll fix that in a moment.

OK, that is fixed now. One of the side effect is that the tokens describing the ENUM are no longer stored in the unknown field, just like it was the case for the SET. So at least, both keywords are now producing the same behavior.

If that's an issue to not have the tokens in this case, I would suggest to create another issue IMO, as this also affected the SET type.