Commits
Korn, Uwe authored and Wes McKinney committed 500134ef7d6
ARROW-3482: [C++] Build with JEMALLOC by default Author: Korn, Uwe <Uwe.Korn@blue-yonder.com> Closes #2739 from xhochy/ARROW-3482 and squashes the following commits: 8e85cf607 <Korn, Uwe> ARROW-3482: Build with JEMALLOC by default