TSql Add rule and keyword for LABEL in OPTIONS of table

[AKryukov92]

No description provided.

[KvanTTT]

Please cover suggested changed by an example.

[KvanTTT]

Can LABEL be identifier? I guess so that why add this token to keyword list.

[AKryukov92]

According to
https://learn.microsoft.com/en-us/sql/t-sql/language-elements/reserved-keywords-transact-sql?view=azuresqldb-current
LABEL is a keyword in Azure Synapse Analytics, which is tsql dialect too.
I'll remove this keyword here because those rules are general purpose

[AKryukov92]

If I add only rule in parser without keyword here, then on parsing

select whatever from tbl OPTION (MAXDOP 1, LABEL = 'Large');

it will throw errors:

mismatched input ',' expecting '.'
mismatched input 'OPTION' expecting '.'
mismatched input 'LABEL' expecting {'CONCAT', 'EXPAND', 'FAST', 'FORCE', 'HASH', 'IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX', 'KEEP', 'KEEPFIXED', 'LOOP', 'MAXDOP', 'MAXRECURSION', 'MERGE', 'OPTIMIZE', 'ORDER', 'PARAMETRIZATION', 'RECOMPILE', 'ROBUST', 'USE', LABEL}

Is there any other way to support this syntax?

[KvanTTT]

I didn't mean adding the rule only to parser. I meant adding both token as you did at the beginning:

LABEL:                                 'LABEL';

and to keyword list:

keyword
    ...
    | LABEL
    ...