+1 (binding)

In <CAJPUwMCsMG5pga5h=+slr97ogkk52ecr8ti-9oftwlhvgf1...@mail.gmail.com>
  "[VOTE] Increment MetadataVersion in Schema.fbs from V4 to V5 for 1.0.0 
release" on Mon, 29 Jun 2020 16:42:45 -0500,
  Wes McKinney <wesmck...@gmail.com> wrote:

> Hi,
> As discussed on the mailing list [1], in order to demarcate the
> pre-1.0.0 and post-1.0.0 worlds, and to allow the
> forward-compatibility-protection changes we are making to actually
> work (i.e. so that libraries can recognize that they have received
> data with a feature that they do not support), I have proposed to
> increment the MetadataVersion from V4 to V5. Additionally, if the
> union validity bitmap changes are accepted, the MetadataVersion could
> be used to control whether unions are permitted to be serialized or
> not (with V4 -- used by v0.8.0 to v0.17.1, unions would not be
> permitted).
> Since there have been no backward incompatible changes to the Arrow
> format since 0.8.0, this would be no different, and (aside from the
> union issue) libraries supporting V5 are expected to accept BOTH V4
> and V5 so that backward compatibility is not broken, and any
> serialized data from prior versions of the Arrow libraries (0.8.0
> onward) will continue to be readable.
> Implementations are recommended, but not required, to provide an
> optional "V4 compatibility mode" for forward compatibility
> (serializing data from >= 1.0.0 that needs to be readable by older
> libraries, e.g. Spark deployments stuck on an older Java-Arrow
> version). In this compatibility mode, non-forward-compatible features
> added in 1.0.0 and beyond would not be permitted.
> A PR with the changes to Schema.fbs (possibly subject to some
> clarifying changes to the comments) is at [2].
> Once the PR is merged, it will be necessary for implementations to be
> updated and tested as appropriate at minimum to validate that backward
> compatibility is preserved (i.e. V4 IPC payloads are still readable --
> we have some in apache/arrow-testing and can add more as needed).
> The vote will be open for at least 72 hours.
> [ ] +1 Accept addition of MetadataVersion::V5 along with its general
> implications above
> [ ] +0
> [ ] -1 Do not accept because...
> [1]: 
> https://lists.apache.org/thread.html/r856822cc366d944b3ecdf32c2ea9b1ad8fc9d12507baa2f2840a64b6%40%3Cdev.arrow.apache.org%3E
> [2]: https://github.com/apache/arrow/pull/7566

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