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https://issues.apache.org/jira/browse/DERBY-3907?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kristian Waagan updated DERBY-3907:
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Attachment: derby-3907-7a2-use_new_framework.stat
derby-3907-7a2-use_new_framework.diff
Patch 'derby-3907-7a2-use_new_framework.diff' is the second part of 7a.
It prepares the code to deal with multiple stream header formats, but doesn't
change the current behavior regarding stream headers.
Committed to trunk with revision 736636.
I will upload the next patch, but will wait a few days before I commit it to
see if any problems are detected with patch 7a2.
> 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
>
>
> 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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