How to recognize a keyword only when followed by an open-paren.
In the example below, "OFFSET" is a keyword, but only should be recognized as such when the next character is an open-paren, "(". The close-paren that indicates an error should actually be the "ROWS" close and the close-paren at the end belongs to the "OFFSET" at the beginning.
What should my lexem look like in order to properly handle this?
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