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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 <wes.mckin...@twosigma.com> Date: 2017-10-21T01:13:16Z Remove page id from Buffer metadata, increment metadata version number Change-Id: I731fa4c54a597fa48eefe88fb47755077b159114 commit 316a50bd51c36cc84e6c691e72a31f4928316f2a Author: Wes McKinney <wes.mckin...@twosigma.com> 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)