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https://issues.apache.org/jira/browse/ARROW-1409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213630#comment-16213630
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ASF GitHub Bot commented on ARROW-1409:
---------------------------------------
GitHub user wesm opened a pull request:
https://github.com/apache/arrow/pull/1225
ARROW-1409: [Format] Remove page id from Buffer metadata, increment
metadata version number
This is a breaking metadata change per discussion on the mailing list. I
expect this kind of truly breaking changes to be exceedingly rare going
forward, and when we make a 1.0.0 release we should document expectations
around metadata / memory format stability.
This could be made backwards compatible with some effort (we would have to
add `RecordBatchV3` and `BufferV3` types).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wesm/arrow ARROW-1409
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/arrow/pull/1225.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1225
----
commit c6fb115e75a452aa73478874013f691693c8c9ec
Author: Wes McKinney <[email protected]>
Date: 2017-10-21T01:13:16Z
Remove page id from Buffer metadata, increment metadata version number
Change-Id: I731fa4c54a597fa48eefe88fb47755077b159114
commit 316a50bd51c36cc84e6c691e72a31f4928316f2a
Author: Wes McKinney <[email protected]>
Date: 2017-10-21T01:20:18Z
Bump metadata version in Java, add check for V4
Change-Id: Ie41bf47bcc81f5f27dc441988aa19fc94e7bb047
----
> [Format] Use for "page" attribute in Buffer in metadata
> -------------------------------------------------------
>
> Key: ARROW-1409
> URL: https://issues.apache.org/jira/browse/ARROW-1409
> Project: Apache Arrow
> Issue Type: Bug
> Components: Format
> Reporter: Wes McKinney
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> This attribute is currently unused in any Arrow implementation. I think the
> original idea is that the "page" might indicate a particular shared memory
> page, so that a record batch could be spread across multiple memory regions.
> The downside of this unused attribute is that Buffer metadata takes 24 bytes
> instead of 16 due to padding.
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