[jira] Commented: (DERBY-2694) org.apache.derby.impl.drda.DDMWriter uses wrong algorithm to avoid spliting varchar in the middle of a multibyte char.

["Anurag Shekhar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-2694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12500304 ] 

Anurag Shekhar commented on DERBY-2694:
---------------------------------------

I think my comments in this issue has been little confusing. 
The patch I have submitted fix of the bug which was corrupting last char while returning from a function. Apart from this issue I have also mentioned another issue in my comments which causes the a large string (containing multibyte chars). These are two different issue. My patch fixes the first issue alone.

> org.apache.derby.impl.drda.DDMWriter uses wrong algorithm to avoid spliting varchar in the middle of a multibyte char.
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2694
>                 URL: https://issues.apache.org/jira/browse/DERBY-2694
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>         Environment: all
>            Reporter: Anurag Shekhar
>            Assignee: Anurag Shekhar
>         Attachments: derby-2694-v2.diff, derby-2694.diff, TestProc.java, TestProc_TruncateRep.java
>
>
> org.apache.derby.impl.drda.DDMWriter uses wrong algorithm to avoid splitting varchar in the middle of a multibyte char.
> When DMWriter finds that it has to split a varchar while sending it to client it checks if the last byte is a part of a multibyte char and in case it is it tries to find the last byte of previous char and sends only till that byte leaving rest of it for the next send.
> The code it uses is having a bug so it fails when the last byte its checking for is the third byte of a char of 3 byte length.

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