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Wes McKinneyUwe L. Korn
c0beb879e3c
Wes McKinney authored and Uwe L. Korn committed 0ced74e1e39
ARROW-1363: [C++] Use buffer layout from dictionary index type in IPC messages

This makes the vector layout consistent with what's being emitted by Java.

This layout isn't used in the C++ IPC reads, as the layout should be deterministic based on the schema types. My understanding is that it's there to enable logical type-agnostic manipulation of the physical memory layout.

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #1003 from wesm/ARROW-1363 and squashes the following commits:

6eef664 [Wes McKinney] Use buffer layout from index type for dictionary-encoded data