Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/908
A careful read of the [Maven dependency
mechanism](https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html)
shows that, in general, we can have conflicts. We would have a conflict if the
Drill root pom.xml added Jackson 2.7.8, but some other project pulled in an
earlier (or, eventually, later) version. Since nearest wins, the dependency for
that project would win -- for that project, and would result in two copies of
Jackson appearing in Drill's build. We've run into such problems multiple times.
But, since that is not the case here, this change is fine.
+1
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