[jira] Commented: (DERBY-3907) Save useful length information for Clobs in store

["Myrna van Lunteren (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12682896#action_12682896 ] 

Myrna van Lunteren commented on DERBY-3907:
-------------------------------------------

It looks like most of the work for this issue has been completed for 10.5.
Is it possible to log a new issue for the remaining tasks?
Does this require a release note?

> Save useful length information for Clobs in store
> -------------------------------------------------
>
>                 Key: DERBY-3907
>                 URL: https://issues.apache.org/jira/browse/DERBY-3907
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Store
>    Affects Versions: 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.5.0.0
>
>         Attachments: derby-3907-1a-alternative_approach.diff, derby-3907-2b-header_write_preparation.diff, derby-3907-2b-header_write_preparation.diff, derby-3907-2b-header_write_preparation.stat, derby-3907-2c-header_write_preparation-PREVIEW.diff, derby-3907-2c-header_write_preparation-PREVIEW.stat, derby-3907-2c-header_write_preparation.diff, derby-3907-2c-header_write_preparation.diff, derby-3907-2c-header_write_preparation.stat, derby-3907-3a-readertoutf8stream_cleanup.diff, derby-3907-3a-readertoutf8stream_cleanup.diff, derby-3907-3a-readertoutf8stream_cleanup.stat, derby-3907-3b-readertoutf8stream_cleanup.diff, derby-3907-4a-add_getStreamWithDescriptor.diff, derby-3907-4a-add_getStreamWithDescriptor.stat, derby-3907-5a-use_getStreamWithDescriptor.diff, derby-3907-5a-use_getStreamWithDescriptor.stat, derby-3907-6a-SQLClob_stream_descriptor_sync.diff, derby-3907-7a-write_new_header_format-PREVIEW.diff, derby-3907-7a-write_new_header_format.diff, derby-3907-7a-write_new_header_format.diff, derby-3907-7a-write_new_header_format.stat, derby-3907-7a1-write_new_header_format.diff, derby-3907-7a2-use_new_framework.diff, derby-3907-7a2-use_new_framework.stat, derby-3907-7a3-use_new_header_format.diff, derby-3907-7a3-use_new_header_format.stat
>
>
> The store should save useful length information for Clobs. This allows the length to be found without decoding the whole data stream.
> The following thread raised the issue on what information to store, and also contains some background information: http://www.nabble.com/Storing-length-information-for-CLOB-on-disk-tp19197535p19197535.html
> The information to store, and the exact format of it, is still to be discussed/determined.
> Currently two bytes are set aside for length information, which is inadequate.

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