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From "Suran Jayathilaka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3741) SQL LENGTH function materializes CLOB into memory
Date Mon, 21 Jul 2008 18:49:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615360#action_12615360

Suran Jayathilaka commented on DERBY-3741:

In a subsequent discussion, Kathey pointed out that the following path might be the one to
For not so large CLOBs, if the stream is resettable, get the utf8length with readExternal()
and return that IF it's not zero.
If it's zero, (i.e. stream could be longer than 65535) can use the UTF8Util class' skipUntilEOF()
method to get how many chars are in the stream, 
but resetting the stream after that.
If the stream is not Resetable, will have to go with getString().length.

> SQL LENGTH function materializes CLOB into memory
> -------------------------------------------------
>                 Key: DERBY-3741
>                 URL: https://issues.apache.org/jira/browse/DERBY-3741
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,,
>            Reporter: Kathey Marsden
>            Assignee: Suran Jayathilaka
>         Attachments: LargeLengthClob.zip
> Similar to DERBY-3732, the SQL LENGTH function also materializes CLOB's into memory.
 See attached repro.

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