[BUG] JSQLParser 5.1 : MySQL : unique index parse fail

[ThinkSure]

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

Failing SQL Feature:

• mysql unique index parse fail  

SQL Example:

• Simplified Query Example, focusing on the failing feature

ALTER TABLE `goods` ADD unique `aaa` ( `cate_id` );



Software Information:

• JSqlParser 5.1
• MySQL 

Tips:

When I add a unique index and specify the name of the index, the parsing will report an error.As the following example

ALTER TABLE `goods` ADD unique `aaa` ( `cate_id` );

 But if I don't specify the index name, the parsing will be successful.As the following example

ALTER TABLE `goods` ADD unique ( `cate_id` );