[BUG] JSQLParser 4.9 : MySQL 8.0 : unable to parse: ALTER TABLE ... ADD INDEX  #2122

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Failing SQL Feature:

• unable to parse: ALTER TABLE .. ADD INDEX fAdd for composite index
• Example: ADD INDEX fAdd ((b + c)) , ADD INDEX fCoalesce ((COALESCE(PK, b)))

SQL Example:

• Simplified Query Example, focusing on the failing feature

ADD INDEX fAdd ((b + c)),
ADD INDEX fCoalesce ((COALESCE(PK, b)));
```

Software Information:

• JSqlParser 4.9
• Database (MySql 8.0)

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stacktrace.txt

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