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From "peng.jianhua (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KYLIN-3072) Fix the regular expression in function 'removeCommentInSql'
Date Fri, 01 Dec 2017 06:21:00 GMT

    [ https://issues.apache.org/jira/browse/KYLIN-3072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274001#comment-16274001
] 

peng.jianhua commented on KYLIN-3072:
-------------------------------------

Hi [~Shaofengshi], I'm sorry. I did not describe this issue clearly. If you still think there
is no problem, I will close the issue according to your review. The essence of this problem
is that the logic of parsing is flawed. The current logic is as following:
1. Firstly,  the "--" was parsed.
2. Secondly, the "/* */" was parsed.
Based on the above parsing logic, once the "/* */" contains the "--" and the "*/" and the
"--" are in the same line , the parsing will be wrong. Because the "*/" will be removed when
the program parses the "--". When parsing the "/* */" again, the program parses fail because
the "*/" was removed.

What we modify is the wrong logic of the program. Based on the above logic modification, all
possible combinations will not be a problem, do you think?

> Fix the regular expression in function 'removeCommentInSql'
> -----------------------------------------------------------
>
>                 Key: KYLIN-3072
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3072
>             Project: Kylin
>          Issue Type: Bug
>          Components: Query Engine
>            Reporter: peng.jianhua
>            Assignee: peng.jianhua
>         Attachments: 0001-KYLIN-3072-Fix-the-regular-expression-in-function-re.patch,
01.png, 02.PNG
>
>
> select * from kylin_sales /\*comments--comments*/
> we should remove comments like '/\*comments*/' first,then remove comments like '--comments'
, or the sql above will have an exception.
> please refer to 01.png.
> if we exchange the sequence of this two comment patterns,we will get 02.png.



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