Author: tedyu <yuzhihong@gmail.com>

Closes #6031 from tedyu/master and squashes the following commits:

5c2580c [tedyu] Reference fasterxml.jackson.version in sql/core/pom.xml
ff2a44f [tedyu] Merge branch 'master' of github.com:apache/spark
28c8394 [tedyu] Upgrade version of jackson-databind in sql/core/pom.xml