[C++] IPC writer sends buffer layout for dictionary rather than indices

[asfimport]

This is because of:

https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/metadata.cc#L321

Since the buffer structure of record batches contains only indices, this should be the buffer layout in the IPC metadata.

We should double check that Java is doing the right thing (I believe it is)

cc [~paul.e.taylor] @lmeyerov

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• [Integration] Validate vector type layout in IPC messages (relates to)

_{Note: This issue was originally created as ARROW-1363. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
PR: #1003

[asfimport]

Uwe Korn / @xhochy:
Issue resolved by pull request 1003
#1003