http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/VOTE-Apache-CarbonData-1-2-0-RC1-release-tp21124p21204.html
As far as I know, following known issues will impact user, it is better to solve them before 1.2
[CARBONDATA-1400] Fix bug of array column out of bound when writing carbondata file
[CARBONDATA-1429] Add a value based compression for decimal data type when decimal is stored as Int or Long